Method and device for transmitting and receiving random access response in two-step random access

Abstract

To provide a method and a device for receiving and transmitting random access response in 2-step random access.SOLUTION: A receiving device includes a first calculation unit that calculates a first RNTI that is different from RA-RNTI actually used in 4-step random access, a first detection unit that uses the first RNTI within a monitoring window to detect downlink control information for scheduling random access responses, and a first receiving unit that receives a random access response on a physical downlink shared channel (PDSCH) on the basis of the downlink control information when the downlink control information is successfully detected.SELECTED DRAWING: Figure 21

Description

[Technical field]

[0001] The present invention relates to the field of wireless communication technology. [Background technology]

[0002] In the LTE (Long Term Evolution) system of 3GPP (registered trademark) (3rd Generation Partnership Project), when a user device first accesses a network, it needs to go through processes such as cell search, acquisition of system information (SI), random access, etc. After acquiring downlink synchronization by cell search, the user device establishes a connection with a cell and acquires uplink synchronization by performing random access based on information such as random access settings included in the system information.

[0003] Figure 1 shows a diagram of a random access process of LTE. A contention-based random access process is taken as an example to explain the process, which includes at least the following four steps: a user equipment sends a preamble (also called Msg1); a network equipment feeds back a random access response (RAR) (also called Msg2) after receiving the preamble; the user equipment sends Msg3 through a physical uplink shared channel (PUSCH); and the network equipment feeds back Msg4 through a physical downlink shared channel (PDSCH). Such a random access process can be called 4-step random access (4-step RACH).

[0004] FIG. 2 shows a random access process of NR (New Radio), and such a random access process can be called 2-step random access (2-step RACH). Compared with the traditional 4-step random access, the 2-step random access can access the network more quickly. As shown in FIG. 2, during 2-step random access, the user equipment transmits msgA, where msgA carries at least the preamble and Msg3 information during 4-step random access; and the network equipment transmits msgB to the user equipment, where msgB carries at least the Msg2 (RAR) and Msg4 information during 4-step random access.

[0005] It should be noted that the introduction of the above background art is intended to clearly and completely explain the technical solutions of the present invention, and to facilitate understanding thereof by those skilled in the art, and these technical solutions are described in the background art of the present invention, and therefore should not be construed as being known to those skilled in the art. Summary of the Invention [Problem to be solved by the invention]

[0006] In the case of 4-step random access or 2-step random access, the time-frequency resource in which the preamble can be transmitted is called a Physical Random Access Channel (PRACH) opportunity, abbreviated as RO. After transmitting the preamble, the user equipment detects Msg2 in 4-step random access or msgB in 2-step random access within one monitoring window corresponding to the RO. In some application scenarios, at least one user equipment adopting 4-step random access and at least one user equipment adopting 2-step random access may coexist.

[0007] The inventor has found the following. That is, whether transmitting and receiving Msg2 or MsgB, one important design requirement is to be able to avoid a certain user equipment mistaking a random access response (Msg2 or msgB) that is not for its RO as its own random access response. In the 4-step random access, for the downlink control information (DCI) that schedules Msg2, its cyclic redundancy check (CRC) is the same as the radio network temporary identifier ( RNTI, Radio Network Temporary Identity ) is scrambled. (meaning "RNTI in RA") is determined by the time-frequency position of the RO, one Msg2 is always for a certain RO. In a monitoring window (also called an RAR window), the user equipment performs blind detection on DCI having a CRC scrambled by the RA-RNTI, and filters out Msg2 for other ROs (i.e., ROs other than the one used by the user equipment itself), thereby avoiding mistaking Msg2 for an RO that is not for the user equipment itself for Msg2.

[0008] For two-step random access, the requirements are more complicated, and it is not only necessary to avoid two-step random access user equipment mistaking msgB not for its RO as its own msgB, but also to avoid two-step random access user equipment mistaking Msg2 not for its RO as its own msgB, and furthermore, it is necessary to avoid four-step random access user equipment mistaking msgB not for its RO as its own Msg2. The conventional four-step random access RA-RNTI method cannot meet such requirements of two-step random access, and therefore cannot be applied to two-step random access.

[0009] To solve at least one of the above problems, an embodiment of the present invention provides a method and apparatus for transmitting and receiving a random access response in two-step random access. [Means for solving the problem]

[0010] According to a first aspect of an embodiment of the present invention, there is provided a method for receiving a random access response in a two-step random access, the method being applied at a user equipment side, the method comprising: Calculate a first RNTI, where the first RNTI is different from the RA-RNTI actually used in the 4-step random access; Detecting Downlink Control Information (DCI) scheduling a random access response using the first RNTI within a monitoring window; and Upon successfully detecting the downlink control information, receiving a random access response on a physical downlink shared channel (PDSCH) based on the downlink control information.

[0011] According to a second aspect of an embodiment of the present invention, there is provided a method for receiving a random access response in two-step random access, the method being applied at a user equipment side, the method comprising: Calculate a first RNTI, the value of the first RNTI being less than or equal to a maximum value of all possible values ​​of RA-RNTI for 4-step random access; Detecting downlink control information scheduling a random access response using the first RNTI within a monitoring window; and Upon successfully detecting the downlink control information, receiving a random access response on a physical downlink shared channel based on the downlink control information.

[0012] According to a third aspect of an embodiment of the present invention, there is provided a method for transmitting a random access response in two-step random access, the method being applied to a network device side, the method comprising: Calculate a first RNTI, where the first RNTI is different from the RA-RNTI actually used in the 4-step random access; Using the first RNTI, scrambling a cyclic redundancy check (CRC) of downlink control information that schedules a random access response; and The method includes transmitting the downlink control information and the random access response.

[0013] According to a fourth aspect of the embodiment of the present invention, there is provided a method for transmitting a random access response in two-step random access, the method being applied to a network device side, the method comprising: Calculate a first RNTI, the value of the first RNTI being less than or equal to a maximum value of all possible values ​​of RA-RNTI for 4-step random access; Using the first RNTI, scrambling a cyclic redundancy check of downlink control information that schedules a random access response; and The method includes transmitting the downlink control information and a random access response.

[0014] According to a fifth aspect of an embodiment of the present invention, there is provided an apparatus for receiving a random access response in a two-step random access, the apparatus being disposed at a user equipment side, the apparatus comprising: a first calculation unit for calculating a first RNTI, where the first RNTI is different from an RA-RNTI actually used in four-step random access; a first detection unit for detecting Downlink Control Information (DCI) for scheduling a random access response using the first RNTI within a monitoring window; and A first receiving unit receives a random access response on a physical downlink shared channel (PDSCH) based on the downlink control information when the downlink control information is successfully detected.

[0015] According to a sixth aspect of an embodiment of the present invention, there is provided an apparatus for receiving a random access response in a two-step random access, the apparatus being disposed at a user equipment side, the apparatus comprising: a fourth calculation unit for calculating a first RNTI, where the value of the first RNTI is less than or equal to a maximum value of all possible values ​​of RA-RNTI for four-step random access; a fourth detection unit for detecting downlink control information scheduling a random access response using the first RNTI within a monitoring window; and A second receiving unit receives a random access response on a physical downlink shared channel based on the downlink control information when the downlink control information is successfully detected.

[0016] According to a seventh aspect of an embodiment of the present invention, there is provided an apparatus for transmitting a random access response in a two-step random access, the apparatus being disposed at a network device side, the apparatus comprising: a seventh calculation unit for calculating a first RNTI, where the first RNTI is different from the RA-RNTI actually used in four-step random access; a first scrambling unit for scrambling a cyclic redundancy check (CRC) of downlink control information for scheduling a random access response using the first RNTI; and The downlink control information and the random access response are transmitted by a first transmission unit.

[0017] According to an eighth aspect of an embodiment of the present invention, there is provided an apparatus for transmitting a random access response in a two-step random access, the apparatus being disposed at a network device side, the apparatus comprising: a tenth calculation unit for calculating a first RNTI, where the value of the first RNTI is less than or equal to a maximum value of all possible values ​​of RA-RNTI for four-step random access; A second scrambling unit that uses the first RNTI to scramble a cyclic redundancy check of downlink control information that schedules a random access response; and A second transmission unit for transmitting the downlink control information and the random access response.

[0018] According to a ninth aspect of an embodiment of the present invention, there is provided a user device, said user device comprising an apparatus according to the fifth or sixth aspect of the embodiment of the present invention.

[0019] According to a tenth aspect of an embodiment of the present invention, there is provided a network device, the network device comprising the device according to the seventh or eighth aspect of the embodiment of the present invention.

[0020] According to an eleventh aspect of an embodiment of the present invention, there is provided a communication system, the communication system including a user device according to the ninth aspect of an embodiment of the present invention and / or a network device according to the tenth aspect of an embodiment of the present invention.

[0021] According to a twelfth aspect of an embodiment of the present invention, there is provided a computer-readable program, which, when executed in an apparatus or user equipment receiving a random access response in two-step random access, causes the apparatus or user equipment receiving the random access response in two-step random access to perform a method for receiving a random access response in two-step random access according to the first or second aspect of the embodiment of the present invention.

[0022] According to a thirteenth aspect of an embodiment of the present invention, there is provided a storage medium storing a computer-readable program, the computer-readable program causing an apparatus or user equipment receiving a random access response in two-step random access to execute a receiving method for receiving a random access response in two-step random access as described in the first or second aspect of the embodiment of the present invention.

[0023] According to a fourteenth aspect of an embodiment of the present invention, there is provided a computer-readable program, which, when executed in an apparatus or a network device that transmits a random access response in two-step random access, causes the apparatus or the network device that transmits a random access response in two-step random access to perform the method for transmitting a random access response in two-step random access according to the third or fourth aspect of the embodiment of the present invention.

[0024] According to a fifteenth aspect of an embodiment of the present invention, there is provided a storage medium storing a computer-readable program, the computer-readable program causing an apparatus or a network apparatus for transmitting a random access response in two-step random access to execute a method for transmitting a random access response in two-step random access relating to the third or fourth aspect of the embodiment of the present invention. Effect of the Invention

[0025] The advantageous effects of the embodiment of the present invention are at least as follows: By using an RNTI different from the RA-RNTI actually used in the 4-step random access to scramble the CRC of the DCI for scheduling msgB, the confusion of RNTI in the 2-step random access can be avoided, in other words, it can not only prevent the user equipment in the 2-step random access from mistaking the msgB or Msg2 not for its RO as the msgB for its RO, but also prevent the user equipment in the 4-step random access from mistaking the msgB not for its RO as the Msg2 for its RO.

[0026] With reference to the following description and drawings, specific embodiments of the present invention are disclosed in detail and show how the principles of the present invention may be employed, but the present invention is not limited in scope to these embodiments, which may include various changes, modifications, and alternatives within the scope of the appended claims.

[0027] Furthermore, features described and / or illustrated in one implementation may be used in the same or similar manner in one or more other embodiments, may be combined with features in the other embodiments, or may be substituted for features in the other embodiments.

[0028] It should be noted that terms such as "comprise / have" when used in this specification refer to the presence of a feature, element, step, or assembly, but do not exclude the presence or addition of one or more other features, elements, steps, or assemblies. [Brief description of the drawings]

[0029] Elements and features described in one drawing or one embodiment of the invention may be combined with elements and features shown in one or more other drawings or embodiments, and in the drawings, like reference numerals are used to indicate corresponding parts in the several drawings and to indicate corresponding parts used in several embodiments.

[0030] The included drawings are used to provide a further understanding of the embodiments of the present invention, and these drawings constitute a part of this specification, illustrate the embodiments of the present invention, and together with the written description, are used to explain the principles of the present invention. Also, it is obvious that the drawings described below are only for illustrating some embodiments of the present invention, and a person skilled in the art can derive other drawings based on these drawings without creative labor. [Figure 1] FIG. 1 illustrates a random access process for LTE. [Diagram 2] A diagram showing the random access process of NR (New Radio). [Diagram 3] FIG. 1 illustrates a communication system according to an embodiment of the present invention. [Figure 4] FIG. 2 is a diagram illustrating an example of a random access process in an embodiment of the present invention. [Diagram 5] FIG. 11 is a diagram illustrating another example of a random access process in an embodiment of the present invention. [Figure 6] FIG. 11 is a diagram illustrating yet another example of a random access process in an embodiment of the present invention. [Figure 7] FIG. 11 is a diagram illustrating a method for receiving a random access response in two-step random access according to the first embodiment of the present invention. [Figure 8] FIG. 4 is a diagram showing an offset in the first embodiment of the present invention. [Figure 9] FIG. 11 is another diagram showing an offset in the first embodiment of the present invention. [Figure 10] FIG. 11 is another diagram showing an offset in the first embodiment of the present invention. [Figure 11] FIG. 13 is yet another diagram showing an offset in the first embodiment of the present invention. [Figure 12] FIG. 11 is another diagram showing a method for receiving a random access response in two-step random access in accordance with embodiment 1 of the present invention. [Figure 13]FIG. 11 is a diagram illustrating yet another example of a random access process in embodiment 1 of the present invention. [Figure 14] FIG. 11 is a diagram illustrating a method for receiving a random access response in two-step random access according to a second embodiment of the present invention. [Figure 15] FIG. 11 is a diagram illustrating a method for transmitting a random access response in two-step random access according to a third embodiment of the present invention. [Figure 16] FIG. 11 is another diagram showing a method of transmitting a random access response in two-step random access according to embodiment 3 of the present invention. [Figure 17] FIG. 11 is a diagram illustrating a method for transmitting a random access response in two-step random access according to a fourth embodiment of the present invention. [Figure 18] FIG. 13 is a diagram illustrating a method for transmitting and receiving a random access response in two-step random access according to a fifth embodiment of the present invention. [Figure 19] FIG. 11 is another diagram showing a method of transmitting and receiving a random access response in two-step random access according to embodiment 5 of the present invention. [Figure 20] FIG. 13 is another diagram showing a method of transmitting and receiving a random access response in two-step random access according to embodiment 6 of the present invention. [Figure 21] FIG. 13 is a diagram illustrating a receiving device of a random access response in two-step random access according to a seventh embodiment of the present invention. [Figure 22] FIG. 21 is a diagram illustrating a first calculation unit 2101 according to a seventh embodiment of the present invention. [Diagram 23] FIG. 21 is a diagram showing a first detection unit 2102 according to a seventh embodiment of the present invention. [Figure 24] FIG. 23 is a diagram illustrating a receiving device of a random access response in two-step random access according to an eighth embodiment of the present invention. [Diagram 25] FIG. 24 is a diagram showing a fourth calculation unit 2401 in the eighth embodiment of the present invention. [Figure 26]FIG. 13 is a diagram illustrating a transmission device of a random access response in two-step random access according to a ninth embodiment of the present invention. [Figure 27] FIG. 26 is a diagram showing a seventh calculation unit 2601 in Example 9 of the present invention. [Figure 28] FIG. 17 is a diagram showing a transmission device of a random access response in two-step random access according to a tenth embodiment of the present invention. [Figure 29] FIG. 28 is a diagram showing a tenth calculation unit 2801 according to a tenth embodiment of the present invention. [Diagram 30] FIG. 23 is a diagram showing a system configuration of a user device according to an eleventh embodiment of the present invention. [Diagram 31] FIG. 23 is a configuration diagram of a network device according to a twelfth embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0031] The above and other features of the present invention will become apparent from the following detailed description and the accompanying drawings, in which: While the specification and drawings disclose certain embodiments of the present invention, they are illustrative of only some of the embodiments which may employ the principles of the present invention, and it is to be understood that the present invention is not limited to the described embodiments, but rather includes all modifications, variations and alternatives within the scope of the appended claims.

[0032] In an embodiment of the present invention, the term "communication network" or "wireless communication network" may refer to a network conforming to any communication standard, such as LTE (Long Term Evolution), LTE-Advanced (LTE-A), WCDMA (Wideband Code Division Multiple Access), HSPA (High-Speed ​​Packet Access), etc.

[0033] Additionally, communications between devices in a communications system may occur according to any stage of communications protocol, including, but not limited to, 1G (generation), 2G, 2.5G, 2.75G, 3G, 4G, 4.5G, future 5G, New Radio (NR), and / or other conventional or future developed communications protocols.

[0034] In the embodiment of the present invention, the term "network device" refers to a device that connects a terminal device to a communication network and provides services to the terminal device in a communication system, for example. The network device may include, but is not limited to, a base station (BS), an access point (AP), a transmission reception point (TRP), a broadcast transmitter, a mobile management entity (MME), a network gateway, a server, a radio network controller (RNC), a base station controller (BSC), etc.

[0035] Among them, the base station may include, but is not limited to, a Node B (NodeB or NB), an evolved Node B (eNodeB or eNB), and a 5G base station (gNB), and may further include a Remote Radio Head (RRH), a Remote Radio Unit (RRU), a relay, or a low power node (e.g., femto, pico, etc.). The term "base station" may include some or all of the functions thereof, and each base station may provide communication coverage for a particular geographical area. The term "cell" may refer to a base station and / or the area it covers, depending on the context of the term.

[0036] In the embodiments of the present invention, the term "User Equipment" (UE) or "Terminal Equipment" (TE) refers to a device that accesses a communication network and receives services from the network, for example, via a network device. The User Equipment may be fixed or mobile, and may also be called a Mobile Station (MS), a terminal, a Subscriber Station (SS), an Access Terminal (AT), a station, etc.

[0037] Among these, user devices may include, but are not limited to, the following: cellular phones, personal digital assistants (PDAs), wireless modems, wireless communication devices, handheld devices, machine type communication devices, laptop computers, cordless telephones, smartphones, smart watches, digital cameras, etc.

[0038] Furthermore, in a scenario such as the Internet of Things (IoT), the user equipment may further be a monitoring or measuring device or apparatus, including, but not limited to, a Machine Type Communication (MTC) terminal, an in-vehicle communication terminal, a Device to Device (D2D) terminal, a Machine to Machine (M2M) terminal, etc.

[0039] Fig. 3 is a diagram showing a communication system in the present invention, and will be described by taking a terminal device and a network device as an example. As shown in Fig. 1, a communication system 100 may include a network device 101 and a terminal device 102. For convenience, one terminal device and one network device are used as an example in Fig. 1, but the present invention is not limited thereto.

[0040] In the embodiment of the present invention, conventional traffic (services) or future services can be carried between the network device 101 and the terminal device 102. These traffics may include, but are not limited to, eMBB (enhanced Mobile Broadband), mMTC (massive Machine Type Communication), URLLC (Ultra-Reliable and Low-Latency Communication), etc.

[0041] Wherein, the user equipment 102 can transmit data to the network equipment 101, for example, can initiate a random access process, which can be a four-step random access (4-step RACH) or a two-step random access (2-step RACH).

[0042] In two-step random access, if the RA-RNTI in four-step random access is still used to scramble the CRC of the DCI scheduling msgB, the two-step random access user equipment may mistakenly recognize msgB or Msg2 that is not for its RO as msgB for its RO, or the four-step random access user equipment may mistakenly recognize msgB that is not for its RO as Msg2 for its RO.

[0043] FIG 4 is a diagram illustrating an example of a random access process in an embodiment of the present invention. As shown in FIG 4, assuming that an unpaired spectrum or a TDD (Time Division Duplex) spectrum is used, the subcarrier spacing is 15 kHz, and no SUL (Supplementary Uplink) carrier is configured. The ROs of the 2-step RACH and the 4-step RACH are multiplexed in a TDM manner.

[0044] In the time domain, according to Table 6.3.3.2-3 of 3GPP TS 38.211 V15.6.0, the PRACH configuration index of the 4-step RACH is set to 5, and the PRACH configuration index of the 2-step RACH is set to 6. Based on the above PRACH configuration, the RO of the 4-step RACH is located in the slot with index 4 in the even system frame, and the RO of the 2-step RACH is located in the slot with index 4 in the odd system frame. In the frequency domain, the frequency resource configuration of the 2-step RACH and the 4-step RACH is not limited, and for convenience, FIG. 2 shows the 2-step RACH and the 4-step RACH with the same frequency resource index, and the parameter definition can be referred to Section 6.3.3.2 of TS 38.211 V15.6.0. Similar to the definition of RO, the PUSCH occasion is abbreviated as PO, which represents the time-frequency resource of the PUSCH.

[0045] In FIG. 4, the PUSCH is located in one adjacent slot after the RO, and there is no limitation on the size and location of the frequency domain resource of the PUSCH. Similar to the monitoring window in the 4-step RACH (also called the RAR monitoring window or RAR window), the 2-step RACH has a msgB monitoring window. The RAR monitoring window is located after the preamble, and the msgB monitoring window is located after the PUSCH (PO). For convenience, the RAR monitoring window and the msgB monitoring window are collectively called the monitoring window in FIG. 4, and it is assumed in FIG. 4 that the time length of the monitoring window is 10 milliseconds (ms), which is the maximum configurable monitoring window length of the 4-step RACH. As shown in FIG. 4, the monitoring window of the 2-step RACH and the monitoring window of the 4-step RACH overlap in time. According to the RA-RNTI calculation method in section 5.1.3 of TS 38.321 V15.6.0, the value of RA-RNTI cycles every 10 milliseconds, so RO1 and RO2 in Fig. 2 have the same RA-RNTI, that is, RNTI confusion occurs. If the 2-step RACH reuses the RA-RNTI, during the time range where the two monitoring windows overlap, the user of the 2-step RACH may mistakenly regard Msg2 (the Msg2 is for RO1) to be sent to the user of the 4-step RACH as msgB to be sent to the user of the 2-step RACH, and at the same time, the user of the 4-step RACH may mistakenly regard msgB (the msgB is for RO2) to be sent to the user of the 2-step RACH as Msg2 to be sent to the user of the 4-step RACH.Since RO1 and RO2 can use the same preamble, a user cannot distinguish whether the preamble belongs to 2-step RACH (corresponding to RO2) or 4-step RACH (corresponding to RO1) by the RAPID (Random Access Preamble Identifier, i.e., preamble ID) in the MAC PDU.

[0046] FIG. 5 is a diagram showing another example of a random access process in an embodiment of the present invention, in which the ROs of 2-step RACH and 4-step RACH are multiplexed in an FDM manner. Specifically, in the time domain, the PRACH configuration index of 4-step RACH is set to 5 according to Table 6.3.3.2-3 of 3GPP TS 38.211 V15.6.0, and the PRACH configuration index of 2-step RACH is set to 5. However, in the frequency domain, the ROs of 4-step RACH and 2-step RACH are configured to occupy different frequency resources, that is, multiplexed in the same slot in an FDM manner. The configuration of other parameters is the same as that of FIG. 4. The 2-step RACH and the 4-step RACH are configured independently, and the indexes n of the frequency resources of both are multiplexed in the same slot. RA (or f_id) is numbered from 0. When the 2-step RACH reuses the RA-RNTI calculation method, the 2-step RACH and the 4-step RACH use the same frequency resource index n RA (or f_id), RO1 and RO2 have the same RA-RNTI, and RNTI confusion may occur in the overlapping parts of the monitoring windows.

[0047] In an embodiment of the present invention, in the 4-step RACH, only the preamble is detected, whereas in the 2-step RACH, not only the preamble needs to be detected but also the PUSCH needs to be demodulated and decoded, and therefore, a longer processing time is required than in the 4-step RACH. Therefore, a monitoring window length longer than that of the 4-step RACH can be set for the 2-step RACH. The maximum monitoring window length of the 4-step RACH is 10 ms, and the maximum monitoring window length of the 2-step RACH may be longer than the maximum monitoring window length of the 4-step RACH, i.e., 10 ms. When the monitoring window length of the 2-step RACH is set longer than the maximum monitoring window length of the 4-step RACH, a larger portion of the monitoring window of the 2-step RACH may overlap in time with the monitoring window of the 4-step RACH, as shown in FIG. 4. Therefore, reusing the RA-RNTI method of the 4-step RACH may cause a 2-step RACH user to mistakenly recognize a 4-step RACH user's Msg2 as a msgB for his / her RO, or a 4-step RACH user to mistakenly recognize a 2-step RACH user's msgB as a Msg2 for his / her RO. In addition, when the monitoring window length of the 2-step RACH is set to be larger than the maximum monitoring window length of the 4-step RACH, reusing the 4-step RACH RA-RNTI method may further cause a 2-step RACH user to mistakenly recognize another 2-step RACH user's msgB as a msgB for his / her RO.

[0048] FIG. 6 illustrates another example of a random access process in an embodiment of the present invention. In the time domain, the PRACH configuration index of the 2-step RACH is set to 12 according to Table 6.3.3.2-3 of 3GPP TS 38.211 V15.6.0. Based on the above PRACH configuration, the RO of the 2-step RACH is located in the slot with index 4 in each system frame. In the frequency domain, the frequency resource configuration of the 2-step RACH is not limited, and for convenience, FIG. 6 shows the 2-step RACH with the same frequency resource index. In FIG. 6, it is assumed that the time length of the monitoring window is 20 ms, which is greater than the maximum configurable monitoring window length of the 4-step RACH, which is 10 ms. As shown in FIG. 6, two monitoring windows of the 2-step RACH overlap in time. If the 2-step RACH reuses the RA-RNTI of the 4-step RACH, RO1 and RO2 in Fig. 6 have the same RA-RNTI value, and within the time range where the two monitoring windows overlap, the user of the 2-step RACH may mistakenly recognize msgB to be sent to another user of the 2-step RACH as msgB to be sent to the user of the 2-step RACH. In summary, when the maximum monitoring window length of the 2-step RACH is longer than the maximum monitoring window length of the 4-step RACH, the reuse of the RA-RNTI method of the 4-step RACH may cause confusion of the RNTI of the 2-step RACH and the 4-step RACH, or may cause confusion of the RNTI of the 2-step RACH itself.

[0049] Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that these embodiments are merely illustrative and do not limit the present invention. EXAMPLES

[0050] An embodiment of the present invention provides a method for receiving a random access response in two-step random access, the method being applied on a user equipment side.

[0051] FIG. 7 is a diagram illustrating a method for receiving a random access response in two-step random access in embodiment 1 of the present invention. As shown in FIG. 7, the method includes the following steps:

[0052] Step 701: Calculate a first RNTI, where the first RNTI is different from the RA-RNTI actually used in the four-step random access; Step 702: Using the first RNTI within a monitoring window, detect for Downlink Control Information (DCI) that schedules a random access response; and Step 703: When the downlink control information is successfully detected, receive a random access response on a Physical Downlink Shared Channel (PDSCH) based on the downlink control information.

[0053] In this way, by scrambling the CRC of the DCI scheduling msgB using an RNTI different from the RA-RNTI actually used in 4-step random access, it is possible to avoid confusion of RNTI in 2-step random access; in other words, it is possible to not only avoid a user equipment with 2-step random access mistaking msgB or Msg2 not for its RO for msgB for its RO, but also to avoid a user equipment with 4-step random access mistaking msgB not for its RO for Msg2 for its RO.

[0054] In step 701, a first RNTI different from the RA-RNTI actually used in the four-step random access is calculated, and the first RNTI is represented as, for example, msgB-RNTI.

[0055] As an example, namely, in case 1) msgB is carried by one MAC PDU (ie, one PDSCH), in this case, the first RNTI can be calculated based on the second RNTI and an offset, for example.

[0056] For example, the first RNTI is calculated based on the following formula (1).

number

[0057] Among them, msgB-RNTI represents the first RNTI, offset indicates the offset, and RA-RNTI 2-step represents the second RNTI.

[0058] In this embodiment, the offset is used to avoid confusion between the msgB-RNTI of the two-step random access and the RA-RNTI of the four-step random access. 2-step is used to avoid confusion of RNTI in two-step random access. In other words, a two-step random access user device cannot mistake Msg2 of a four-step random access user device as msgB for its RO, a four-step random access user device cannot mistake msgB of a two-step random access user device as Msg2 for its RO, and a two-step random access user device cannot mistake msgB of another two-step random access user device as msgB for its RO. In this embodiment, the offset (offset) may be set by a network device.

[0059] For example, the offset (offset) can be set by a network device using at least one of the following methods: a broadcast message; RRC signaling; and a MAC control element (MAC CE).

[0060] For example, the broadcast message may be system information SIB1 or MIB.

[0061] In this embodiment, the offset value is not limited to a specific value.

[0062] For example, the offset may be greater than or equal to a value determined based on one of the following: the numerical range of the RA-RNTI; the numerical range of the RA-RNTI and the configuration information of the second carrier; the numerical range of the RA-RNTI, the configuration information of the second carrier and the first PRACH configuration information in the four-step random access on the second carrier; the configuration information of the second carrier, the second PRACH configuration information in the four-step random access on the second carrier and the second PRACH configuration information in the four-step random access on the first carrier.

[0063] In this embodiment, the RA-RNTI is the RA-RNTI in four-step random access. For example, the RA-RNTI can be calculated by the following formula (2):

number

[0064] Among them, RA-RNTI 4-step represents the RA-RNTI for 4-step random access, and s_id 4-step indicates the index of the first symbol where the RO of the 4-step random access is located, and 0≦s_id 4-step < 14;t_id 4-step indicates the index of the first slot in which the RO is located within one system frame SFN, and 0≦t_id 4-step < 80;f_id 4-step represents the index of the frequency resource in which the RO is located in the frequency domain, and 0≦f_id 4-step <8, and up to 8 ROs can be configured in the frequency domain using FDM;ul_carrier_id 4-stepindicates the index of the uplink carrier used to transmit the 4-step random access preamble, 0≦ul_carrier_id 4-step When ul_carrier_id is < 2 and the carrier used is the NUL (Normal Uplink) carrier, 4-step ul_carrier_id when =0 and the SUL (Supplementary Uplink) carrier is used 4-step =1.

[0065] In this embodiment, for example, the first carrier is a NUL (Normal Uplink) carrier, and the second carrier is a SUL (Supplementary Uplink) carrier.

[0066] For example, the offset is equal to or greater than a value determined based on the numerical range of the RA-RNTI, and can be calculated, for example, by the following formula (3).

number

[0067] Among them, max{RA-RNTI that can be used by 4-step RACH} represents the maximum value of RA-RNTI that can be used by 4-step random access; in other words, the offset may be greater than or equal to the maximum value of all possible values ​​of the RA-RNTI.

[0068] By substituting the above formula (3) and the ranges of related parameters into the above formula (3), the following formula (4) can be obtained.

number

[0069] Wherein, 17920 is the maximum value of the RA-RNTI that the four-step random access can use, that is, the maximum value among all possible values ​​of the RA-RNTI.

[0070] In this way, the offset is set to be equal to or greater than the maximum value (maximum possible value) of all possible values ​​of the RA-RNTI of the 4-step RACH, and the introduction of the offset can ensure that the value range of the msgB-RNTI of the 2-step RACH does not overlap with the value range of the RA-RNTI of the 4-step RACH. Therefore, it can be ensured that the msgB-RNTI of the 2-step RACH does not have the same value as the RA-RNTI of the 4-step RACH. Since different RNTIs are used for the msgB of the 2-step RACH and the Msg2 of the 4-step RACH, the user of the 2-step RACH cannot mistake the Msg2 of the 4-step RACH user as the msgB for his / her RO, and the user of the 4-step RACH cannot mistake the msgB of the 2-step RACH user as the Msg2 for his / her RO.

[0071] FIG. 8 is a diagram showing offsets in the first embodiment of the present invention. As shown in FIG. 8, the numerical range of RA-RNTI for 4-step RACH is shown in the form of a two-dimensional map. In FIG. 8, each lattice represents one available RA-RNTI value, which depends on the PRACH resource configuration, and not all RA-RNTIs are necessarily used, so the filled lattice represents the RA-RNTI actually used. Thus, the available RA-RNTI and the RA-RNTI actually used can be distinguished. The RA-RNTI is uniquely determined by the time index (s_id, t_id), frequency index (f_id) and carrier index (ul_carrier_id) corresponding to the RO, and the value of the RA-RNTI increases with increasing time index (s_id, t_id), increases with increasing frequency index (f_id), and increases with increasing carrier index (ul_carrier_id). The above formulas (4) and (5) correspond to setting the offset to be equal to or greater than the maximum value of all possible values ​​of RA-RNTI, as shown in FIG. 8. The minimum value of offset can be considered to granularity the space of all available RA-RNTI values.

[0072] Also, for example, the offset (offset) is equal to or greater than a value determined based on the numerical range of the RA-RNTI and the configuration information of the second carrier, and can be calculated, for example, based on the following formula (5).

number

[0073] Among them, ul_carrier_id represents the index of the uplink carrier used to transmit the preamble, max{RA-RNTI that can be used when 4-step RACH has ul_carrier_id=0 (i.e., "RA-RNTI available in 4-step RACH when ul_carrier_id=0" in Formula 5)} represents the maximum value among all possible values ​​of the RA-RNTI for which the condition that the index of the uplink carrier used to transmit the preamble is zero is satisfied, and max{RA-RNTI that can be used by 4-step RACH (i.e., "RA-RNTI available in 4-step RACH" in Formula 5)} represents the maximum value of the RA-RNTI that can be used by 4-step random access.

[0074] By substituting the above formula (3) and the ranges of related parameters into the above formula (5), the following formula (6) can be obtained.

number

[0075] Of these, 8960 is the maximum value among all possible values ​​of the RA-RNTI for which the condition that the index of the uplink carrier used to transmit the preamble is zero is satisfied, and 17920 is the maximum value of the RA-RNTI that can be used by 4-step random access.

[0076] In this way, a user of the 2-step RACH can know the SUL carrier configuration information by receiving the system information SIB1, and the SUL carrier configuration information includes at least whether the SUL carrier is configured. The above information can further determine the value range of the RA-RNTI of the 4-step RACH. When the SUL carrier is not configured, according to the method in section 5.1.3 of TS 38.321 V15.6.0, the value of ul_carrier_id cannot be 1. Therefore, the numerical range of the RA-RNTI of the 4-step RACH is determined to be 1 to 8960. In this case, by setting the offset to 8960 or more, it is possible to avoid overlap with the numerical range of the msgB-RNTI of the 2-step RACH. Otherwise, that is, when the SUL carrier is configured, it is necessary to determine the numerical range of the RA-RNTI of the 4-step RACH as 1 to 17920. In this case, by setting the offset to 17920 or more, it is possible to avoid overlap with the numerical range of the msgB-RNTI of the 2-step RACH. In this way, a 2-step RACH user cannot mistake a 4-step RACH user's Msg2 for its own msgB, and a 4-step RACH user cannot mistake a 2-step RACH user's msgB for its own Msg2.

[0077] Fig. 9 is another diagram showing an offset in the first embodiment of the present invention. As shown in Fig. 9, the diagram on the left side shows that when there is no SUL carrier, the offset is set to be equal to or greater than the maximum available RA-RNTI when ul_carrier_id=0, that is, the occurrence of RNTI overlap and confusion can be avoided, and the diagram on the right side shows that when there is an SUL, the offset needs to be set to be equal to or greater than the maximum value of all available values ​​of RA-RNTI. It may be considered that the minimum value of the offset has ul_carrier_id (carrier) as the granularity, and the offset in the diagram on the left side of Fig. 9 is equal to or greater than the numerical value space of all available RA-RNTIs when ul_carrier_id=0, and the minimum value of the offset in the diagram on the right side of Fig. 9 has the numerical value space of all available RA-RNTIs when ul_carrier_id=0 and ul_carrier_id=1 as the granularity.

[0078] Furthermore, for example, the offset (offset) is greater than or equal to a value determined based on the numerical range of the RA-RNTI, the configuration information of the second carrier, and the first PRACH configuration information of the four-step random access on the second carrier, and can be calculated, for example, based on the following formula (7).

number

[0079] Among them, ul_carrier_id indicates the index of the uplink carrier used to transmit the preamble, max{RA-RNTI that can be used by 4-step RACH when ul_carrier_id=0} represents the maximum value of all possible values ​​of the RA-RNTI that satisfies the condition that the index of the uplink carrier used to transmit the preamble is zero, and max{RA-RNTI that can be used by 4-step RACH} indicates the maximum value of the RA-RNTI that can be used by 4-step random access.

[0080] By substituting the above formula (2) and the ranges of related parameters into the above formula (7), the following formula (8) can be obtained.

number

[0081] Of these, 8960 is the maximum value among all possible values ​​of the RA-RNTI for which the condition that the index of the uplink carrier used to transmit the preamble is zero is satisfied, and 17920 is the maximum value of the RA-RNTI that can be used by 4-step random access.

[0082] In this way, the user of the 2-step RACH can know the SUL carrier configuration information (including at least whether the SUL carrier is configured) by receiving the system information SIB1, and can know the first PRACH configuration information of the 4-step RACH on the SUL carrier, and the first PRACH configuration information includes at least whether the PRACH resource of the 4-step RACH is configured. If the SUL carrier is not configured, or if the SUL carrier is configured but the PRACH resource of the 4-step RACH is not configured on the SUL carrier, then the numerical range of the RA-RNTI of the 4-step RACH is determined to be 1 to 8960, and the offset is set to 8960 or more to avoid overlap with the numerical range of the msgB-RNTI of the 2-step RACH; otherwise, the numerical range of the RA-RNTI of the 4-step RACH is determined to be 1 to 17920, and the offset is set to 17920 or more to avoid overlap with the numerical range of the msgB-RNTI of the 2-step RACH. In this way, a 2-step RACH user cannot mistake a 4-step RACH user's Msg2 for its own msgB, and a 4-step RACH user cannot mistake a 2-step RACH user's msgB for its own Msg2. See Figure 9 for visualization of formulas (7) and (8).

[0083] In addition, for example, the offset (offset) is determined based on the configuration information of the second carrier, the second PRACH configuration information of the four-step random access on the second carrier, and the second PRACH configuration information of the four-step random access on the first carrier, and can be calculated, for example, by the following formula (9):

number

[0084] Among them, (outside 1) TIFF0007643500000010.tif16170 indicates the msg1-FDM parameters in the PRACH resource configuration of the 4-step RACH of the NUL carrier, (outside 2) TIFF0007643500000011.tif16170 represents the msg1-FDM parameter in the PRACH resource configuration of the 4-step RACH of the SUL carrier, where the value of msg1-FDM is one of 1, 2, 4, and 8, and is used to indicate the number of ROs that are multiplexed in the FDM manner in the frequency domain.

[0085] In this way, a user of a 2-step RACH can know SUL carrier configuration information (including at least whether a SUL carrier is configured) by receiving the system information SIB1, and can also obtain second PRACH configuration information of a 4-step RACH on a NUL and / or SUL carrier, where the second PRACH configuration information at least includes whether a PRACH resource of a 4-step RACH is configured and a specific PRACH resource configuration of the 4-step RACH. The PRACH resource configuration includes an upper layer parameter msg1-FDM. By using these pieces of information, the value range of the RA-RNTI of the 4-step RACH can be further determined. If a SUL carrier is not configured, or if a SUL carrier is configured but a PRACH resource of a 4-step RACH is not configured on the SUL carrier, the value range of the RA-RNTI of the 4-step RACH can be further determined. (Outside 3) TIFF0007643500000012.tif18170 At this time, the offset is (outside 4) TIFF0007643500000013.tif15170 If the RA-RNTI range of the 4-step RACH is set to 0, the overlap of the RNTI range of the 4-step RACH and the 2-step RACH can be avoided. If not, the RA-RNTI range of the 4-step RACH can be set to 0. (outside 5) TIFF0007643500000014.tif14170 At this time, the offset is (outside 6) TIFF0007643500000015.tif17170 By setting the above, it is possible to prevent the occurrence of overlap of the RNTI value ranges of the 4-step RACH and 2-step RACH. In this way, a 2-step RACH user cannot mistake Msg2 of a 4-step RACH user for its own msgB, and a 4-step RACH user cannot mistake msgB of a 2-step RACH user for its own Msg2.

[0086] FIG. 10 is another diagram showing an offset in the first embodiment of the present invention. As shown in FIG. 10, the minimum value of offset may be said to shift (offset) by using f_id as granularity or "row" in FIG. 10 as granularity. The offset in the left diagram of FIG. 10 is equal to or greater than the "row" where the maximum RA-RNTI actually used is located when ul_carrier_id=0 (one carrier), and the offset in the right diagram of FIG. 10 is equal to or greater than the "row" where the maximum RA-RNTI actually used is located when ul_carrier_id=0 and ul_carrier_id=1 (two carriers). In other words, the offset is equal to or greater than the maximum value of all possible values ​​of the RA-RNTI for which the condition that the index of the frequency resource where the RO is located is equal to the index of the frequency resource corresponding to the maximum RA-RNTI actually used is satisfied.

[0087] In addition, for example, the offset (offset) is greater than or equal to a value determined based on the configuration information of the second carrier, the second PRACH configuration information of the 4-step random access on the second carrier, and the second PRACH configuration information of the 4-step random access on the first carrier, and for example, the offset can be calculated based on the following formula (10):

number

[0088] Among them, max{RA-RNTI actually used by 4-step RACH} represents the maximum RA-RNTI actually used.

[0089] In this way, the user of the 2-step RACH can know the SUL carrier configuration information by receiving the system information SIB1, and the SUL carrier configuration information includes at least whether the SUL carrier is configured, and can also obtain the second PRACH configuration information of the 4-step RACH on the NUL and / or SUL carrier. The second PRACH configuration information includes at least whether the PRACH resource of the 4-step RACH is configured, and the specific PRACH resource configuration of the 4-step RACH. The PRACH resource configuration includes all the necessary information for calculating the RA-RNTI of the 4-step RACH. Based on the PRACH resource configuration, the user of the 2-step RACH can obtain all the values ​​of the RA-RNTI that are currently already used by the 4-step RACH. Therefore, the offset can be selected to be equal to or greater than the maximum value of all the values ​​of the RA-RNTI, so that the occurrence of the overlap of the numerical range of the RNTI of the 4-step RACH and the 2-step RACH can be avoided. This prevents a 2-step RACH user from mistaking Msg2 of a 4-step RACH user for his / her own msgB, and prevents a 4-step RACH user from mistaking msgB of a 2-step RACH user for his / her own Msg2.

[0090] FIG. 11 is another diagram showing offset in the first embodiment of the present invention. As shown in FIG. 11, the minimum value of offset has the granularity of the grid in FIG. 11. The offset in the diagram on the left side of FIG. 11 is equal to or larger than the "grid" in which the maximum RA-RNTI actually used is located when ul_carrier_id=0 (one carrier), and the offset in the diagram on the right side of FIG. 11 is equal to or larger than the "grid" in which the maximum RA-RNTI actually used is located when ul_carrier_id=0 and ul_carrier_id=1 (two carriers). In other words, the offset is equal to or larger than the maximum RA-RNTI actually used.

[0091] The method for determining the offset "offset" has been described above as an example.

[0092] Hereinafter, a method for determining the second RNTI will be illustratively described based on the relationship between the monitoring window length of the 2-step random access (also referred to as the msgB monitoring window) and the monitoring window length of the 4-step random access.

[0093] For example, when the maximum length of the monitoring window (msgB monitoring window) of the two-step random access is less than or equal to the maximum monitoring window length of the four-step random access, the second RNTI is determined based on the index of the first symbol in which the RO of the two-step random access is located, the index of the first slot in which it is located within one system frame, the index of the frequency resource in which it is located, and the index of the uplink carrier used to transmit the preamble.

[0094] For example, the second RNTI can be calculated by referring to the RA-RNTI of four-step random access.

[0095] For example, similar to formula (2), the second RNTI can be calculated based on the following formula (11).

number

[0096] Among them, RA_RNTI 2-step indicates the second RNTI, and s_id 2-step represents the index of the first symbol where the RO is located in the two-step random access, and 0≦s_id 2-step < 14;t_id 2-step represents the index of the first slot in which the RO is located in one system frame SFN, and 0≦t_id 2-step < 80;f_id 2-step f_id indicates the index of the frequency resource in which the RO is located in the frequency domain, and 0≦f_id 2-step<8, and up to 8 ROs can be configured in the frequency domain using FDM;ul_carrier_id 2-step indicates the index of the uplink carrier used to transmit the preamble of the two-step random access, 0≦ul_carrier_id 2-step When ul_carrier_id is <2 and the NUL (Normal Uplink) carrier is used, 2-step ul_carrier_id when =0 and the SUL (Supplementary Uplink) carrier is used 2-step =1.

[0097] For example, by substituting the above formula (11) and formula (3) into formula (1), the following formula (12) can be obtained.

number

[0098] The meaning of each parameter can be found in formula (11) and formula (3), so detailed explanations are omitted here.

[0099] Furthermore, for example, by substituting the above formulas (11) and (5), or (11) and (7) into formula (1), the following formula (13) can be obtained.

number

[0100] Among them, condition 1 is “when the SUL carrier is not configured”, and condition 2 is “when the SUL carrier is not configured, or when the SUL carrier is configured but the PRACH resource of the 4-step RACH is not configured on the SUL carrier”. The meanings of the other parameters can be found in formula (11), so detailed explanations are omitted here.

[0101] Furthermore, for example, by substituting the above formulas (11) and (9) into formula (1), the following formula (14) can be obtained.

number

[0102] The meaning of each parameter can be found in formulas (11) and (9), so detailed explanations are omitted here.

[0103] For example, when the maximum length of the monitoring window (msgB monitoring window) of the two-step random access is greater than the maximum monitoring window length of the four-step random access, the second RNTI is determined based on the index of the first symbol in which the two-step random access RO is located, the index of the first slot in one system frame in which it is located, the index of the frequency resource in which it is located, the index of the uplink carrier used for transmitting the preamble, the system frame index, and the maximum monitoring window length corresponding to the subcarrier spacing, or the second RNTI or the fifth RNTI is determined based on the index of the first symbol in which the two-step random access RO is located, the index of the first slot in one system frame in which it is located, the index of the frequency resource in which it is located, the index of the uplink carrier used for transmitting the preamble, the system frame index, and the maximum monitoring window length.

[0104] In this embodiment, for example, 10240 is divisible by the maximum monitoring window length in milliseconds.

[0105] For example, W μ max Or W max The following limitation may be made: 10240 is W μ max Or W max In other words, 10240 is W μ max Or W maxThe reason is as follows: the SFN index range is 0 to 1023, that is, the SFN period is 10240 ms, and 10240 is the W μ max Or W max If the SFN index is not an integer multiple of W, when the previous SFN index is 1023 and the next SFN index is 0, there may be a t_id_new in SFN#1023 whose count is less than one period. This means that the interval between SFN#1023 and the next SFN#0 having the same t_id_new is smaller than W, and the two monitoring windows corresponding to the ROs of these two t_id_new overlap, and RNTI confusion may still occur in the overlapping portion. Or, μ max Or W max The following restriction may be applied to slots whose count is less than one period (W), that is, these slots are not used for transmitting preambles (i.e., are not used as ROs). Since ROs that may cause ambiguity are not used, confusion of RNTIs can be avoided as well.

[0106] For example, the second RNTI can be calculated based on the following formula (15):

number

[0107] Among them, s_id 2-step , t_id 2-step and ul_carrier_id 2-step The meaning of is the same as formula (11), so we will not explain it in detail here. μ = 0, 1, 2, 3, and the values ​​of μ corresponding to the subcarrier spacing of 15 kHz, 30 kHz, 60 kHz, and 120 kHz are 0, 1, 2, and 3, respectively. For the exact definition of μ, refer to Section 5.1.3 of TS 38.321 V15.6.0. μ max is 15 x 2 μRepresents the maximum monitoring window length corresponding to a subcarrier spacing of kHz, denoted as W μ max The unit of is ms, and W μ max is larger than the maximum monitoring window length of 4-step RACH (e.g., 10 milliseconds), and different subcarrier spacings may have independent maximum monitoring window lengths W μ max may have; W indicates the number of slots included in the monitoring window; SFN_id represents the SFN index, where 0 ≤ SFN_id < 1024; t_id_new represents the slot number within the monitoring window, where 0 ≤ t_id_new < W, that is, the period is W; RA-RNTI 2-step can avoid the occurrence of RNTI confusion in 2-step RACH.

[0108] The RA-RNTI in formula (15) 2-step is related to μ, and μ is used for the calculation of RA-RNTI 2-step For example, taking Figure 6 as an example, for each variable in formula (15), the variables t_id_new corresponding to RO1 and RO2 are 4 and 14 respectively, and all other variables corresponding to RO1 and RO2 are the same. Therefore, the RA-RNTI calculated for RO1 and RO2 2-step are different from each other, so the RNTI confusion in 2-step RACH can be avoided. Formula (1) can further avoid the occurrence of RNTI confusion in 2-step RACH and 4-step RACH due to the offset. By using formula (1) and formula (15), not only can the occurrence of RNTI confusion in 2-step RACH and 4-step RACH be avoided, but also the occurrence of RNTI confusion within 2-step RACH itself can be avoided. That is, it can be avoided that a user of 2-step RACH receives msgB sent to other users of 2-step RACH and / or Msg2 sent to users of 4-step RACH, and it can also be avoided that a 4-step RACH user receives msgB sent to other users of 2-step RACH.

[0109] In this embodiment, RA-RNTI is used regardless of μ. 2-step For example, by substituting μ=3 into formula (15), we can obtain the following formula (16).

number

[0110] The meaning of each parameter can be found in formula (15), so detailed explanations are omitted here.

[0111] In this way, different subcarrier intervals have the same maximum monitoring window length. Therefore, the RA-RNTI in formula (16) 2-step is unrelated to μ. Note that the effects that can be achieved are similar to those described above, so detailed descriptions are omitted here.

[0112] The method of determining the second RNTI based on the relationship between the monitoring window length in two-step random access and the monitoring window length in four-step random access has been described above as an example.

[0113] In this embodiment, step 701 calculates a first RNTI, and step 702 uses the first RNTI within a monitoring window to detect Downlink Control Information (DCI) for scheduling a random access response.

[0114] For specific detection methods, reference can be made to the related art.

[0115] In step 703, upon successful detection of the DCI, receive a random access response on a PDSCH based on the DCI.

[0116] Above, a method for receiving a random access response when msgB is carried by one MAC PDU has been described as example 1).

[0117] Below, another example, namely, Example 2) will be described on how to receive a random access response when msgB is carried by two MAC PDUs (ie, two PDSCHs).

[0118] For example, msgB is divided into fallbackRAR (or Msg2-like msgB) and successRAR (or Msg4-like msgB). For 2-step RACH, when the network device detects the presence of a preamble but does not correctly demodulate and decode the PUSCH associated with the preamble, the network device sends fallbackRAR to indicate that the user of 2-step random access sends Msg3, which is equivalent to falling back to 4-step random access; when the network device detects the presence of a preamble and correctly demodulates and decodes the PUSCH associated with the preamble, the network device sends successRAR to indicate the successful access of the user of 2-step random access.

[0119] In this case, two RNTIs (e.g., denoted as msgB-RNTI-1 and msgB-RNTI-2) are used for fallbackRAR and successRAR, respectively. In fact, for the above case where msgB is carried by one MAC PDU, it is equivalent to fallbackRAR and successRAR being carried by one MAC PDU. When 2-step random access uses a different RO from 4-step random access and msgB is carried by two MAC PDUs, the fallbackRAR of 2-step random access is very similar to Msg2 of 4-step random access, but both cannot be carried by one MAC PDU (they both use the same RNTI, e.g., RA-RNTI of 4-step random access). Because when 2-step random access uses a different RO (e.g., RO1 and RO2 in FIG. 4) from 4-step random access, 2-step random access can use the same preamble (i.e., the same RAPID) as 4-step random access, and ambiguity will occur because users cannot distinguish between 2-step random access and 4-step random access by RAPID in MAC PDU. Therefore, fallbackRAR also needs to use a different RNTI from RA-RNTI of 4-step random access. msgB-RNTI-1 and msgB-RNTI-2 are used for fallbackRAR and successRAR, respectively.

[0120] For example, the first RNTI includes a third RNTI and / or a fourth RNTI.

[0121] FIG. 12 is another diagram illustrating a method for receiving a random access response in two-step random access in embodiment 1 of the present invention. As shown in FIG. 12, the method includes the following steps:

[0122] Step 1201: Calculate a third RNTI and / or a fourth RNTI, where the third RNTI and the fourth RNTI are different from the RA-RNTI actually used in the four-step random access; Step 1202: Perform detection on a first downlink control information scheduling a first random access response using the third RNTI within a monitoring window; and / or perform detection on a second downlink control information scheduling a second random access response using the fourth RNTI within a monitoring window; and Step 1203: When the first downlink control information is successfully detected, receive a first random access response on a first physical downlink shared channel (PDSCH) based on the first downlink control information, and / or when the second downlink control information is successfully detected, receive a second random access response on a second physical downlink shared channel (PDSCH) based on the second downlink control information.

[0123] In this embodiment, the third RNTI can be represented as msgB-RNTI-1, and the fourth RNTI can be represented as msgB-RNTI-2.

[0124] In step 1201, for example, a third RNTI is calculated based on a fifth RNTI and a first offset; and / or a fourth RNTI is calculated based on the fifth RNTI, the first offset, and a second offset.

[0125] For example, the third RNTI and the fourth RNTI can be calculated based on the following formulas (17) and (18).

number

number

[0126] Among them, msgB-RNTI-1 indicates the third RNTI, msgB-RNTI-2 indicates the fourth RNTI, offset1 indicates the first offset, offset2 indicates the second offset, and RA-RNTI 2-step represents the fifth RNTI.

[0127] In this embodiment, msgB-RNTI-1 may be used for fallbackRAR and msgB-RNTI-2 may be used for successRAR, or msgB-RNTI-1 may be used for successRAR and msgB-RNTI-2 may be used for fallbackRAR.

[0128] In this way, not only can the RNTI of the 2-step RACH and the 4-step RACH be confused, but also the RNTI of the 2-step RACH itself can be confused. In this embodiment, the first offset (offset1) and the second offset (offset2) can be set by the network device.

[0129] For example, the first offset offset1 and the second offset offset2 may be configured by the network device using at least one of the following manners: broadcast message; RRC signaling; and MAC control element (MAC CE).

[0130] For example, the broadcast message may be system information SIB1 or MIB.

[0131] In this embodiment, the specific values ​​of the first offset offset1 and the second offset offset2 are not limited.

[0132] For example, the method of determining the first offset, offset1, may be the same as the method of determining the offset, offset, in the above example 1).

[0133] For example, the first offset offset1 may be greater than or equal to a value determined based on one of the following: the numerical range of the RA-RNTI; the numerical range of the RA-RNTI and configuration information of the second carrier; the numerical range of the RA-RNTI, configuration information of the second carrier and the first PRACH configuration information of the four-step random access on the second carrier; and the configuration information of the second carrier, the second PRACH configuration information of the four-step random access on the second carrier and the second PRACH configuration information of the four-step random access on the first carrier.

[0134] For example, the first offset offset1 can be calculated by any one of formulas (3)-(10) in example 1) above.

[0135] In this embodiment, the method of determining the second offset offset2 may be similar to the method of determining the above offset offset, but the corresponding parameters of the four-step random access need to be replaced with parameters of the two-step random access during calculation.

[0136] For example, the second offset is greater than or equal to a value determined based on one of the following: a numerical range of the fifth RNTI; a numerical range of the fifth RNTI and configuration information of the second carrier; a numerical range of the fifth RNTI, configuration information of the second carrier and first PRACH configuration information of two-step random access on the second carrier; and configuration information of the second carrier, second PRACH configuration information of two-step random access on the second carrier and second PRACH configuration information of two-step random access on the first carrier.

[0137] In other words, the second offset is one or more of the following values: the maximum value among all possible values ​​of the fifth RNTI; the maximum value among all possible values ​​of the fifth RNTI for which the condition that the index of the uplink carrier used to transmit the preamble is zero is satisfied; the maximum value among all possible values ​​of the fifth RNTI for which the condition that the index of the frequency resource in which the RO is located is equal to the index of the frequency resource corresponding to the maximum of the fifth RNTI actually used is satisfied; and the maximum of the fifth RNTI actually used.

[0138] For example, similar to formulas (3), (5), (7), (9), and (10) in Example 1) above, the second offset offset2 can be calculated based on the following formulas (19), (20), (21), (22), and (23).

number

number

number

number

number

[0139] Among them, RA-RNTI in the above formulas (19), (20), (21), (22), and (23) 2-step represents the fifth RNTI, and the meanings of the other parameters can be referred to the meanings of the corresponding parameters in formulas (3), (5), (7), (9), and (10), so detailed explanations are omitted here.

[0140] In this embodiment, the fifth RNTI can be obtained in a manner similar to the calculation of the second RNTI in example 1) above.

[0141] For example, when the maximum length of the monitoring window (msgB monitoring window) of the two-step random access is less than or equal to the maximum monitoring window length of the four-step random access, the fifth RNTI is determined based on the index of the first symbol in which the two-step random access RO is located, the index of the first slot in which it is located within a system frame, the index of the frequency resource in which it is located, and the index of the uplink carrier used to transmit the preamble.

[0142] For example, the fifth RNTI can be obtained by calculation with reference to formula (11) in Example 1) above.

[0143] For example, when the maximum length of the monitoring window (msgB monitoring window) of the two-step random access is greater than the maximum monitoring window length of the four-step random access, the fifth RNTI is determined based on the index of the first symbol in which the two-step random access RO is located, the index of the first slot in one system frame in which it is located, the index of the frequency resource in which it is located, the index of the uplink carrier used for transmitting the preamble, the system frame index, and the maximum monitoring window length corresponding to the subcarrier spacing, or the second RNTI or the fifth RNTI is determined based on the index of the first symbol in which the two-step random access RO is located, the index of the first slot in one system frame in which it is located, the index of the frequency resource in which it is located, the index of the uplink carrier used for transmitting the preamble, the system frame index, and the maximum monitoring window length.

[0144] In this embodiment, for example, 10240 is divisible by the maximum monitoring window length in milliseconds.

[0145] For example, the fifth RNTI can be obtained by calculation with reference to formula (15) or formula (16) in Example 1) above.

[0146] In this embodiment, after the third RNTI and / or the fourth RNTI is calculated in step 1201, the specific implementation of steps 1202 and 1203 is similar to steps 702 and 703, and thus a detailed description thereof is omitted here.

[0147] The above description is based on the viewpoint that msgB is carried by one or two MAC PDUs. Below, the following description is based on the viewpoint that 2-step random access (2-step RACH) and 4-step random access (4-step RACH) use the same RO.

[0148] For example, when two-step random access and four-step random access share an RO and / or the maximum monitoring window length is less than or equal to 10 milliseconds, the fifth RNTI is determined based on the index of the first symbol in which the two-step random access RO is located, the index of the first slot in one system frame in which it is located, the index of the frequency resource in which it is located, and the index of the uplink carrier used to transmit the preamble, and the first offset is equal to zero.

[0149] The 2-step RACH may use the same RO as the 4-step RACH, or may use a different RO from the 4-step RACH. Using the same RO is also called shared RO, and using different RO is also called separated RO. When the 2-step RACH and the 4-step RACH use the same RO, the 2-step RACH and the 4-step RACH use different preambles, i.e., the 2-step RACH and the 4-step RACH are distinguished by the preamble, and when the 2-step RACH and the 4-step RACH use different ROs, the 2-step RACH and the 4-step RACH can be distinguished by the RO, so the 2-step RACH and the 4-step RACH may use the same preamble.

[0150] The above method can be applied whether the 2-step RACH uses the same RO as the 4-step RACH or a different RO from the 4-step RACH, i.e., when fallbackRAR and successRAR are carried by one MAC PDU, msgB-RNTI is used for msgB, and when fallbackRAR and successRAR are carried by two MAC PDUs, msgB-RNTI-1 and msgB-RNTI-2 are used for fallbackRAR and successRAR, respectively.

[0151] In particular, on the premise that the maximum monitoring window length of msgB of the 2-step RACH is less than or equal to the maximum monitoring window length of Msg2 of the 4-step RACH (i.e., 10 ms), when fallbackRAR and successRAR are respectively carried by two MAC PDUs, and the 2-step RACH uses the same RO as the 4-step RACH, another implementation manner may be adopted. Specifically, msgB-RNTI-1=RA-RNTI 2-step is used for fallbackRAR, msgB-RNTI-2=offset2+RA-RNTI 2-stepis used for successRAR, i.e., offset1 is equal to 0. Due to the sharing of RO, msgB-RNTI-1 and RA-RNTI of 4-step RACH are the same, and in this case, Msg2 of 4-step RACH and fallbackRAR of 2-step RACH cannot be distinguished by RNTI, but they can be further distinguished by RAPID carried in MAC PDU, so finally, no ambiguity occurs. Also, due to the sharing of RO, this is equivalent to RA-RNTI being used for fallbackRAR, and msgB-RNTI in formula (1) is used for successRAR. At this time, the use of RNTI is divided into two cases: when fallbackRAR and successRAR are respectively carried by two MAC PDUs and the 2-step RACH uses the same RO as the 4-step RACH, only one new RNTI (msgB-RNTI) is used; and when fallbackRAR and successRAR are respectively carried by two MAC PDUs and the 2-step RACH uses a different RO from the 4-step RACH, two new RNTIs (i.e., msgB-RNTI-1 and msgB-RNTI-2) are used. When offset1 and offset2 can be set by the network device, when fallbackRAR and successRAR are respectively carried by two MAC PDUs and the 2-step RACH uses the same RO as the 4-step RACH, the network device can set offset1 equal to 0. The following Table 1 summarizes the usage of RNTI. [Table 1]

[0152] Also, for 2-step random access (2-step RACH), after the RO and PO resources are configured, the configured slot or symbol for transmitting the preamble and / or the PUSCH may become unavailable, for example, when a set of symbols in a certain slot is a downlink or flexible symbol, or when a user needs to cancel the transmission of the preamble or cancel the transmission of the PUSCH on a set of symbols in a certain slot, the slot or symbol is considered unavailable. The exact conditions for a user to cancel the transmission of the preamble and / or the PUSCH can be found in Section 11.1 of TS 38.213 V15.6.0, so a detailed description thereof will be omitted here. When a slot or symbol in which the PUSCH is located is unavailable but a slot or symbol in which the associated preamble is located is available, the user can still transmit the preamble using the slot or symbol in which the preamble is located, i.e., fallback to be used as a conventional 4-step RACH. For the 4-step RACH, the monitoring window may start after the slot or symbol where the preamble is located. However, when falling back to the 4-step RACH due to unavailability of the PUSCH, even if only the preamble is transmitted, the monitoring window cannot start after the slot or symbol where the preamble is located, otherwise it may cause the problem of RNTI confusion.

[0153] FIG. 13 is a diagram showing another example of a random access process in the first embodiment of the present invention. In the time domain, the PRACH configuration index of the 2-step RACH is set to 12 according to Table 6.3.3.2-3 of 3GPP TS 38.211 V15.6.0. Based on the above PRACH configuration, the RO of the 2-step RACH is located in the slot with index 4 in each system frame. In the frequency domain, the frequency resource configuration of the 2-step RACH is not limited, and for convenience, FIG. 13 shows the 2-step RACH with the same frequency resource index. In FIG. 13, it is assumed that the time length of the monitoring window is 10 milliseconds and the maximum monitoring window length is also 10 milliseconds. In FIG. 13, the slot 5 of SFN#1 is set to PO, but according to the conditions of Section 11.1 of TS 38.213 V15.6.0, the slot cannot be used for transmitting PUSCH, but RO2 can still be used for transmitting preamble. According to the conventional 4-step random access (4-step RACH) method, the monitoring window corresponding to RO2 starts from slot 5, but the monitoring window overlaps with the monitoring window of RO1. Also, since the RNTIs corresponding to RO1 and RO2 are the same, RNTI confusion occurs in the overlapping portion of the monitoring windows.

[0154] In this embodiment, when the slot or symbol where the uplink shared channel is located is unavailable and the slot or symbol where the preamble associated with the uplink shared channel is located is available, the two-step random access allows the slot or symbol where the preamble associated with the uplink shared channel is located to transmit the preamble, and the monitoring window is located after the slot or symbol where the uplink shared channel is located. For example, the monitoring window is after the last symbol of the PO and starts from the first symbol of the earliest CORESET (control resource set) for receiving the PDCCH scheduling msgB. Still taking Figure 13 as an example, the monitoring window of RO2 can start from slot 6, that is, still according to the starting position of the corresponding monitoring window when PUSCH exists, and at this time, the monitoring window does not overlap, so that the confusion of RNTI can be avoided.

[0155] Alternatively, when a slot or symbol in which the uplink shared channel is located is unavailable and a slot or symbol in which a preamble associated with the uplink shared channel is located is available, the two-step random access does not allow a preamble to be transmitted using the slot or symbol in which the preamble associated with the uplink shared channel is located. By adding such a restriction, the above-mentioned RNTI confusion problem can be similarly avoided.

[0156] As can be seen from the above embodiment, by using an RNTI different from the RA-RNTI actually used in 4-step random access to perform CRC scrambling on the DCI scheduling msgB, it is possible to avoid confusion of RNTI in 2-step random access; in other words, it is possible to not only avoid a user equipment in 2-step random access mistaking msgB or Msg2 not for its RO as msgB for its RO, but also to avoid a user equipment in 4-step random access mistaking msgB not for its RO as Msg2 for its RO. EXAMPLES

[0157] An embodiment of the present invention provides a method for receiving a random access response in two-step random access, the method being applied on a user equipment side.

[0158] FIG. 14 is a diagram illustrating a method for receiving a random access response in two-step random access according to embodiment 2 of the present invention. As shown in FIG. 14, the method includes the following steps:

[0159] Step 1401: Calculate a first RNTI, where the value of the first RNTI is less than or equal to the maximum value of all possible values ​​of RA-RNTI for 4-step random access; Step 1402: Using the first RNTI within a monitoring window, detect downlink control information scheduling a random access response; and Step 1403: When the downlink control information is successfully detected, receive a random access response on a physical downlink shared channel based on the downlink control information.

[0160] Corresponding to example 1) in embodiment 1, that is, the case where msgB is carried by one MAC PDU, step 1401 can calculate the first RNTI based on the second RNTI and an offset.

[0161] For example, the offset is equal to or greater than a value determined according to the configuration information of the second carrier, the second PRACH configuration information of the four-step random access on the second carrier, and the second PRACH configuration information of the four-step random access on the first carrier, and the sum of the msg1-FDM parameter in the PRACH resource configuration of the four-step random access of a carrier and the msg1-FDM parameter in the PRACH resource configuration of the two-step random access of the same carrier is equal to or less than 8. For example, the offset can be obtained by calculating according to the following formula (24):

number

[0162] Among them, (outer 7) TIFF0007643500000032.tif13170 represents the msg1-FDM parameter in the PRACH resource configuration of the 4-step RACH of the NUL carrier, (outside 8) TIFF0007643500000033.tif18170 represents the msg1-FDM parameter in the PRACH resource configuration of the 4-step RACH of the SUL carrier, where the msg1-FDM value is one of 1, 2, 4, and 8, and is used to indicate the number of ROs to be multiplexed in the frequency domain by FDM.

[0163] The following restrictions are imposed on the parameters in formula (24):

number

number

[0164] In this embodiment, the calculation method of the second RNTI can refer to the description in the first embodiment, for example, the second RNTI can be calculated according to formula (11) in the first embodiment.

[0165] By substituting the above formula (24) and formula (11) into formula (1), we obtain the following formula (25).

number

[0166] The meanings of the specific parameters can be found in formulas (1), (11), and (24), and detailed explanations are omitted here.

[0167] In case of example 2) in embodiment 1), i.e., when msgB is carried by two MAC PDUs, the first RNTI includes a third RNTI and a fourth RNTI, and the values ​​of the third RNTI and the fourth RNTI are both less than or equal to the maximum value of all possible values ​​of RA-RNTI for 4-step random access, in step 1401, calculate the third RNTI based on the fifth RNTI and a first offset offset1; and / or calculate the fourth RNTI based on the fifth RNTI, the first offset offset1 and a second offset offset2.

[0168] For example, the first offset offset1 is equal to or greater than a value determined based on the configuration information of the second carrier, the second PRACH configuration information of the 4-step random access on the second carrier, and the second PRACH configuration information of the 4-step random access on the first carrier; the second offset offset2 is equal to or greater than a value determined based on the configuration information of the second carrier, the second PRACH configuration information of the 2-step random access on the second carrier, and the second PRACH configuration information of the 2-step random access on the first carrier; and the sum of the msg1-FDM parameter in the PRACH resource configuration of the 4-step random access of a carrier and twice the msg1-FDM parameter in the PRACH resource configuration of the 2-step random access of the same carrier is equal to or less than 8.

[0169] For example, the first offset offset1 can be obtained by calculation based on the above formula (24), and the second offset offset2 can be obtained by calculation based on the following formula (26).

number

[0170] Among them, (outer 9) TIFF0007643500000038.tif15170 represents the msg1-FDM parameters in the PRACH resource configuration of the 2-step RACH of the NUL carrier, (Outside 10) TIFF0007643500000039.tif15170 shows the msg1-FDM parameters in the PRACH resource configuration of the 2-step RACH of the SUL carrier.

[0171] The following restrictions are imposed on the parameters in formula (26):

number

number

[0172] Due to this limitation, the msgB-RNTI value of the 2-step RACH is equal to or less than the maximum value of the RA-RNTI available for the 4-step RACH, i.e., the msgB-RNTI and the RA-RNTI have one common numerical range, which is the numerical range of the RA-RNTI available for the 4-step RACH. Although support for the 2-step RACH is further added based on the 4-step RACH in this manner, the RNTIs (msgB-RNTI and RA-RNTI) of the random access response used for the 4-step RACH and the 2-step RACH are still within the numerical range of the RA-RNTI of the 4-step RACH, i.e., the numerical range of the RNTI used for the random access response is not extended.

[0173] As can be seen from the above embodiment, by placing restrictions on the msg1-FDM parameter, the value of the first RNIT can be made to be less than or equal to the maximum value of all possible values ​​of RA-RNTI for 4-step random access, and also RNTI confusion in 2-step random access can be avoided. EXAMPLES

[0174] In an embodiment of the present invention, a method for sending a random access response in two-step random access is provided, which is applied to a network device side, and corresponds to the method for receiving a random access response in two-step random access described in the first embodiment, which is applied to a user device side, and the same or related contents can refer to the description in the first embodiment.

[0175] Corresponding to example 1) in embodiment 1, i.e., the case where msgB is carried by one MAC PDU, FIG. 15 is a diagram showing a method for transmitting a random access response in two-step random access according to embodiment 3 of the present invention. As shown in FIG. 15, the method includes the following steps:

[0176] Step 1501: calculate a first RNTI, where the first RNTI is different from the RA-RNTI actually used in the four-step random access; Step 1502: Using the first RNTI, scramble a cyclic redundancy check (CRC) of downlink control information for scheduling a random access response; and Step 1503: Transmit the downlink control information and the random access response.

[0177] For example, in step 1501, the first RNTI is calculated based on the second RNTI and an offset. In this embodiment, the specific method for calculating the second RNTI may be the same as the method described in the first embodiment, and the duplicated description will be omitted here.

[0178] In step 1502, the calculated first RNTI is used to scramble the CRC of the DCI for scheduling the random access response. For specific methods of scrambling, refer to related prior art, and detailed descriptions are omitted here.

[0179] In step 1503, for example, the CRC-scrambled DCI is transmitted via the PDCCH, and the random access response is transmitted via the PDSCH.

[0180] In this embodiment, the offset may be set by a network device. For example, as shown in FIG. 15, before step 1501, the method may further include the following steps:

[0181] Step 1504: Set an offset in at least one of the following manners: a broadcast message; an RRC signaling; and a MAC control element (MAC CE).

[0182] For example, the broadcast message may be system information SIB1 or MIB.

[0183] In this embodiment, the offset value is not limited to a specific value.

[0184] For example, the method of determining the offset may be the same as the method described in the first embodiment, and a duplicated description will be omitted here.

[0185] Corresponding to example 2) in embodiment 1, i.e., the case where msgB is carried by two MAC PDUs, Figure 16 is another diagram showing a method for sending a random access response in two-step random access according to embodiment 3 of the present invention. As shown in Figure 16, the method includes the following steps:

[0186] Step 1601: Calculate a third RNTI and / or a fourth RNTI, where the third RNTI and the fourth RNTI are different from the RA-RNTI actually used in the four-step random access; Step 1602: Using the third RNTI to scramble a cyclic redundancy check of a first downlink control information for scheduling a random access response; and / or using the fourth RNTI to scramble a cyclic redundancy check of a second downlink control information for scheduling a random access response; and Step 1603: Send the first downlink control information and the first random access response; and / or send the second downlink control information and the second random access response.

[0187] In step 1601, for example, a third RNTI is calculated based on a fifth RNTI and a first offset, and / or a fourth RNTI is calculated based on the fifth RNTI, the first offset, and a second offset.

[0188] In this embodiment, the method of calculating the third RNTI and the fourth RNTI, and the method of calculating the fifth RNTI are the same as those described in the first embodiment, and therefore, repeated description will be omitted here.

[0189] In this embodiment, the first offset and / or the second offset may be set by a network device. For example, as shown in FIG. 16, before step 1601, the method further includes the following steps:

[0190] Step 1604: Set the first offset and / or the second offset by at least one of the following manners: a broadcast message; an RRC signaling; and a MAC control element (MAC CE).

[0191] For example, the broadcast message may be system information SIB1 or MIB.

[0192] In this embodiment, the specific values ​​of the first offset and the second offset are not limited.

[0193] For example, the method of determining the first offset and the second offset is the same as that described in the first embodiment, and therefore a duplicated description will be omitted here.

[0194] As can be seen from the above embodiment, by scrambling the CRC of the DCI scheduling msgB using an RNTI different from the RA-RNTI actually used in 4-step random access, it is possible to avoid confusion of RNTI in 2-step random access; in other words, it is possible to avoid a user equipment in 2-step random access mistaking msgB or Msg2 not for its RO for msgB for its RO, and it is also possible to avoid a user equipment in 4-step random access mistaking msgB not for its RO for Msg2 for its RO. EXAMPLES

[0195] In an embodiment of the present invention, a method for sending a random access response in two-step random access is provided, which is applied to a network device side, and corresponds to the method for receiving a random access response in two-step random access described in embodiment 2, which is applied to a user device side, and the same or related content can be referred to the description in embodiment 2.

[0196] FIG. 17 is a diagram illustrating a method for transmitting a random access response in two-step random access according to embodiment 4 of the present invention. As shown in FIG. 17, the method includes the following steps:

[0197] Step 1701: Calculate a first RNTI, where the value of the first RNTI is less than or equal to the maximum value of all possible values ​​of RA-RNTI for four-step random access; Step 1702: Using the first RNTI, scramble a cyclic redundancy check of downlink control information for scheduling a random access response; and Step 1703: Transmit the downlink control information and the random access response.

[0198] In step 1701, the calculation method of the first RNTI may be the same as that described in the second embodiment, and the duplicated description will be omitted here.

[0199] Regarding the specific implementation methods of steps 1702 and 1703, reference can be made to the implementation of the relevant steps in the third embodiment, and duplicated explanations will be omitted here.

[0200] As can be seen from the above embodiment, by restricting the msg1-FDM parameter, the value of the first RNIT can be made to be less than or equal to the maximum value of all possible values ​​of RA-RNTI for 4-step random access, and also RNTI confusion in 2-step random access can be avoided. EXAMPLES

[0201] In an embodiment of the present invention, a method for sending and receiving a random access response in two-step random access is provided, and the method is applied to a network device side and a user equipment side, which corresponds to the method for receiving a random access response in two-step random access applied to the user equipment side described in Example 1 and the method for sending a random access response in two-step random access applied to the network device side described in Example 3. For the same or related content, reference can be made to the descriptions in Examples 1 and 3.

[0202] Corresponding to example 1) in embodiment 1, i.e., the case where msgB is carried by one MAC PDU, Figure 18 shows a method for transmitting and receiving a random access response in two-step random access according to embodiment 5 of the present invention. As shown in Figure 18, the method includes the following steps:

[0203] Step 1801: A network device calculates a first RNTI, where the first RNTI is different from the RA-RNTI actually used in the four-step random access; Step 1802: the network device uses the first RNTI to scramble a cyclic redundancy check (CRC) of downlink control information for scheduling a random access response; step 1803: the network device sends the downlink control information and the random access response; Step 1804: The user equipment calculates a first RNTI, where the first RNTI is different from the RA-RNTI actually used in the four-step random access; Step 1805: The user equipment detects downlink control information for scheduling a random access response using the first RNTI within a monitoring window; and Step 1806: When the user equipment successfully detects the downlink control information, receive a random access response on a Physical Downlink Shared Channel (PDSCH) based on the downlink control information.

[0204] Corresponding to example 2) in embodiment 1, i.e., the case where msgB is carried by two MAC PDUs, Figure 19 shows another method for transmitting and receiving a random access response in two-step random access in embodiment 5 of the present invention. As shown in Figure 19, the method includes the following steps:

[0205] Step 1901: A network device calculates a third RNTI and / or a fourth RNTI, where the third RNTI and the fourth RNTI are different from the RA-RNTI actually used in the four-step random access; Step 1902: The network device uses the third RNTI to scramble a cyclic redundancy check of the first downlink control information for scheduling a random access response; and / or uses the fourth RNTI to scramble a cyclic redundancy check of the second downlink control information for scheduling a random access response; Step 1903: The network device sends the first downlink control information and the first random access response; and / or sends the second downlink control information and the second random access response; Step 1904: The user equipment calculates a third RNTI and / or a fourth RNTI, where the third RNTI and the fourth RNTI are different from the RA-RNTI actually used in the four-step random access; Step 1905: Perform detection on a first downlink control information scheduling a first random access response using the third RNTI within a monitoring window; and / or perform detection on a second downlink control information scheduling a second random access response using the fourth RNTI within a monitoring window; and Step 1906: when the first downlink control information is successfully detected, receive a first random access response on a first physical downlink shared channel (PDSCH) based on the first downlink control information; and / or when the second downlink control information is successfully detected, receive a second random access response on a second physical downlink shared channel (PDSCH) based on the second downlink control information.

[0206] In this embodiment, the implementation of each of the above steps can be referred to in the explanations in the first and third embodiments, and duplicate explanations will be omitted here.

[0207] As can be seen from the above embodiment, by scrambling the CRC of the DCI scheduling msgB using an RNTI different from the RA-RNTI actually used in 4-step random access, it is possible to avoid confusion of RNTI in 2-step random access. In other words, it is possible to avoid a user equipment in 2-step random access mistaking msgB or Msg2 not for its RO for msgB for its RO, and it is also possible to avoid a user equipment in 4-step random access mistaking msgB not for its RO for Msg2 for its RO. EXAMPLES

[0208] In an embodiment of the present invention, a method for sending and receiving a random access response in two-step random access is provided, and the method is applied to the network device side and the user equipment side, which corresponds to the method for receiving a random access response in two-step random access applied to the user equipment side described in Example 2 and the method for sending a random access response in two-step random access applied to the network device side described in Example 4. For the same or related content, reference can be made to the descriptions in Examples 2 and 4.

[0209] FIG. 20 is another diagram illustrating a method for transmitting and receiving a random access response in two-step random access according to embodiment 6 of the present invention. As shown in FIG. 20, the method includes the following steps:

[0210] Step 2001: A network device calculates a first RNTI, where the value of the first RNTI is less than or equal to the maximum value of all possible values ​​of RA-RNTI for four-step random access; Step 2002: the network device uses the first RNTI to scramble a cyclic redundancy check of downlink control information for scheduling a random access response; Step 2003: the network device sends the downlink control information and the random access response; Step 2004: The user equipment calculates a first RNTI, where the value of the first RNTI is less than or equal to the maximum value of all possible values ​​of RA-RNTI for four-step random access; Step 2005: The user equipment detects, within a monitoring window, the first RNTI for downlink control information scheduling a random access response; and Step 2006: When the user equipment successfully detects the downlink control information, receive a random access response on a physical downlink shared channel based on the downlink control information.

[0211] In this embodiment, the implementation of each of the above steps can be referred to in the explanations in the second and fourth embodiments, and duplicate explanations will be omitted here.

[0212] As can be seen from the above embodiment, by placing restrictions on the msg1-FDM parameter, it is possible to ensure that the value of the first RNIT is less than or equal to the maximum of all possible values ​​of RA-RNTI for 4-step random access, and also to avoid confusion of RNTI in 2-step random access as well. EXAMPLES

[0213] In an embodiment of the present invention, a device for receiving a random access response in two-step random access is provided, and the device can be located at a user device side. The principle of the device for solving the problem is similar to that of the method in embodiment 1, and the specific implementation can refer to the implementation of the method in embodiment 1, and the duplicated description of the same or related parts will be omitted.

[0214] FIG. 21 is a diagram showing a receiving device for a random access response in two-step random access according to the seventh embodiment of the present invention. As shown in FIG. 21, the device 2100 includes:

[0215] A first calculation unit 2101: calculates a first RNTI, the first RNTI being different from the RA-RNTI actually used in the four-step random access; A first detection unit 2102: detects, using the first RNTI within a monitoring window, a downlink control information (DCI) for scheduling a random access response; and A first receiving unit 2103: upon successfully detecting the downlink control information, receives a random access response on a Physical Downlink Shared Channel (PDSCH) according to the downlink control information.

[0216] For example, the first calculation unit 2101 calculates the first RNTI based on the second RNTI and an offset.

[0217] For example, corresponding to example 2) in example 1, the first RNTI includes a third RNTI and / or a fourth RNTI, and FIG. 22 is a diagram showing a first calculation unit 2101 in example 7 of the present invention. As shown in FIG. 22, the first calculation unit 2101 includes the following:

[0218] A second calculation unit 2201: calculates the third RNTI based on the fifth RNTI and the first offset; and / or A third calculation unit 2202 calculates the fourth RNTI based on the fifth RNTI, the first offset and the second offset.

[0219] FIG. 23 illustrates a first detection unit 2102 according to the seventh embodiment of the present invention. As shown in FIG. 23, the first detection unit 2102 includes:

[0220] A second detection unit 2301: detects a first downlink control information scheduling a first random access response using the third RNTI within a monitoring window; and / or A third detecting unit 2302: detects, within a monitoring window, for a second downlink control information scheduling a second random access response using the fourth RNTI.

[0221] In this embodiment, the functions of each unit described above can be realized by referring to the description of the corresponding steps in the first embodiment, and the duplicated description will be omitted here.

[0222] As can be seen from the above embodiment, by scrambling the CRC of the DCI that schedules msgB using an RNTI different from the RA-RNTI actually used in 4-step random access, it is possible to avoid confusion of RNTI in 2-step random access. In other words, it is possible to avoid a user equipment with 2-step random access mistaking msgB or Msg2 that is not for its RO for msgB for its RO, and it is also possible to avoid a user equipment with 4-step random access mistaking msgB that is not for its RO for Msg2 for its RO. EXAMPLES

[0223] In an embodiment of the present invention, a device for receiving a random access response in two-step random access is provided, and the device can be located at a user device side. The principle of the device for solving the problem is similar to that of the method in embodiment 2, and the specific implementation can refer to the implementation of the method in embodiment 2, and the duplicated description of the same or related parts will be omitted.

[0224] FIG. 24 is a diagram showing a receiving device for a random access response in two-step random access according to the eighth embodiment of the present invention. As shown in FIG. 24, the device 2400 includes:

[0225] A fourth calculation unit 2401: calculates a first RNTI, where the value of the first RNTI is less than or equal to the maximum value of all possible values ​​of RA-RNTI of four-step random access; A fourth detection unit 2402: detects, using the first RNTI within a monitoring window, downlink control information for scheduling a random access response; and A second receiving unit 2403: upon successfully detecting the downlink control information, receives a random access response on a physical downlink shared channel according to the downlink control information.

[0226] For example, the fourth calculation unit 2401 calculates the first RNTI based on the second RNTI and an offset.

[0227] For example, corresponding to example 2) in embodiment 1, the first RNTI includes a third RNTI and / or a fourth RNTI, and FIG. 25 is a diagram showing a fourth calculation unit 2401 in embodiment 8 of the present invention. As shown in FIG. 25, the fourth calculation unit 2401 includes the following:

[0228] A fifth calculation unit 2501: calculates the third RNTI based on the fifth RNTI and the first offset; and / or A sixth calculation unit 2502: calculates the fourth RNTI based on the fifth RNTI, the first offset and the second offset.

[0229] In this embodiment, the implementation of the functions of each unit described above can be referred to the description of the corresponding steps in the second embodiment, and duplicated description will be omitted here.

[0230] As can be seen from the above embodiment, by placing restrictions on the msg1-FDM parameter, it is possible to ensure that the value of the first RNIT is less than or equal to the maximum of all possible values ​​of RA-RNTI for 4-step random access, and also to avoid confusion of RNTI in 2-step random access as well. EXAMPLES

[0231] In an embodiment of the present invention, a device for sending a random access response in two-step random access is provided, and the device can be located at a network device side. The principle of the device for solving the problem is similar to that of the method in embodiment 3, and the specific implementation can refer to the implementation of the method in embodiment 3, and the duplicated description of the same or related parts will be omitted.

[0232] FIG. 26 is a diagram showing a device for transmitting a random access response in two-step random access according to the ninth embodiment of the present invention. As shown in FIG. 26, the device 2600 includes:

[0233] A seventh calculation unit 2601: calculates a first RNTI, the first RNTI being different from the RA-RNTI actually used in the four-step random access; A first scrambling unit 2602: using the first RNTI to scramble a cyclic redundancy check (CRC) of downlink control information for scheduling a random access response; and A first sending unit 2603: sends the downlink control information and the random access response.

[0234] For example, the seventh calculation unit 2601 calculates the first RNTI based on the second RNTI and an offset.

[0235] Corresponding to Example 2) in Example 1, FIG. 27 is a diagram showing a seventh calculation unit 2601 in Example 9 of the present invention. As shown in FIG. 27, the seventh calculation unit 2601 includes:

[0236] An eighth calculation unit 2701: calculates the third RNTI based on the fifth RNTI and the first offset; and / or A ninth calculation unit 2702: calculates the fourth RNTI based on the fifth RNTI, the first offset and the second offset.

[0237] In this case, the first scrambling unit 2602 uses the third RNTI to scramble the cyclic redundancy check of the first downlink control information for scheduling the random access response, and / or uses the fourth RNTI to scramble the cyclic redundancy check of the second downlink control information for scheduling the random access response.

[0238] In this embodiment, as shown in FIG. 26, the apparatus 2600 may further include:

[0239] A setting unit 2604: sets at least one of the offset, the first offset and the second offset according to at least one of the following: a broadcast message; an RRC signaling; and a MAC control element (MAC CE).

[0240] In this embodiment, the implementation of the functions of each unit described above can be referred to the description of the corresponding steps in the third embodiment, and duplicated descriptions will be omitted here.

[0241] As can be seen from the above embodiment, by scrambling the CRC of the DCI that schedules msgB using an RNTI different from the RA-RNTI actually used in 4-step random access, it is possible to avoid confusion of RNTI in 2-step random access. In other words, it is possible to avoid a user equipment with 2-step random access mistaking msgB or Msg2 that is not for its RO for msgB for its RO, and it is also possible to avoid a user equipment with 4-step random access mistaking msgB that is not for its RO for Msg2 for its RO. EXAMPLES

[0242] In an embodiment of the present invention, a device for sending a random access response in two-step random access is provided, and the device can be located at a network device side. The principle of the device for solving the problem is similar to that of the method in embodiment 4, and the specific implementation can refer to the implementation of the method in embodiment 4, and the duplicated description of the same or related parts will be omitted.

[0243] FIG. 28 is a diagram showing a device for transmitting a random access response in two-step random access according to the tenth embodiment of the present invention. As shown in FIG. 28, the device 2800 includes:

[0244] A tenth calculation unit 2801: calculates a first RNTI, where the value of the first RNTI is less than or equal to the maximum value of all possible values ​​of RA-RNTI of four-step random access; A second scrambling unit 2802: using the first RNTI to scramble a cyclic redundancy check of downlink control information for scheduling a random access response; and A second sending unit 2803: sends the downlink control information and the random access response.

[0245] For example, the tenth calculation unit 2801 calculates the first RNTI based on the second RNTI and an offset.

[0246] Corresponding to Example 2) in the first embodiment, FIG. 29 is a diagram showing a tenth calculation unit 2801 in the tenth embodiment of the present invention. As shown in FIG. 29, the tenth calculation unit 2801 includes the following:

[0247] An eleventh calculation unit 2901: calculates the third RNTI based on the fifth RNTI and the first offset; and / or A twelfth calculation unit 2902: calculates the fourth RNTI based on the fifth RNTI, the first offset and the second offset.

[0248] In this embodiment, the implementation of the functions of each unit described above can be referred to the description of the corresponding steps in the fourth embodiment, and duplicated descriptions will be omitted here.

[0249] As can be seen from the above embodiment, by placing restrictions on the msg1-FDM parameter, it is possible to ensure that the value of the first RNIT is less than or equal to the maximum of all possible values ​​of RA-RNTI for 4-step random access, and also to avoid confusion of RNTI in 2-step random access as well. EXAMPLES

[0250] In an embodiment of the present invention, a user equipment is provided, and the user equipment includes a receiving device for a random access response in two-step random access according to the seventh or eighth embodiment.

[0251] Figure 30 is a system configuration diagram of a user device according to embodiment 11 of the present invention. As shown in Figure 30, a user device 3000 may include a processor 3010 and a memory 3020, and the memory 3020 is connected to the processor 3010. It should be noted that this figure is merely an example, and the structure may be supplemented or replaced with other types of structures to realize telecommunication functions or other functions.

[0252] In one implementation, the function of the device receiving a random access response in two-step random access can be integrated into the processor 3010.

[0253] Corresponding to embodiment 7, the processor 3010 may be configured as follows: calculate a first RNTI, where the first RNTI is different from the RA-RNTI actually used in the four-step random access; use the first RNTI within a monitoring window to detect downlink control information (DCI) for scheduling a random access response; and when the downlink control information is successfully detected, receive a random access response on a physical downlink shared channel (PDSCH) based on the downlink control information.

[0254] Corresponding to the eighth embodiment, the processor 3010 may be configured to: calculate a first RNTI, where the value of the first RNTI is less than or equal to the maximum value of all possible values ​​of RA-RNTI for four-step random access; use the first RNTI within a monitoring window to detect downlink control information for scheduling a random access response; and when the downlink control information is successfully detected, receive a random access response on a physical downlink shared channel according to the downlink control information. In another implementation method, the device for receiving a random access response in two-step random access may be arranged separately from the processor 3010. For example, the device for receiving a random access response in two-step random access may be configured as a chip connected to the processor 3010, and the function of the device for receiving a random access response in two-step random access may be realized under the control of the processor 3010.

[0255] As shown in Fig. 30, the user device 3000 may further include a communication module 3030, an input unit 3040, a display 3050, a power supply 3060, etc. It is not necessary for the user device 3000 to include all the components shown in Fig. 30. The user device 3000 may further include components not shown in Fig. 30, but reference can be made to related art regarding this.

[0256] As shown in FIG. 30 , the processor 3010, which may be referred to as a controller or operational control, may include a microprocessor, other processing device, and / or logic device, and can receive inputs and control the operation of each component of the user device 3000.

[0257] The storage 3020 may be one or more of a buffer, a flash memory, a HDD, a removable medium, a volatile storage, a non-volatile storage, or other suitable devices, and may store various data and may also store programs for information processing. The processor 3010 may execute the programs stored in the storage 3020 to store and process information. The functions of the other components are similar to those of the conventional components, and detailed descriptions thereof are omitted here. Each component of the user device 3000 may be realized by dedicated hardware, firmware, software, or a combination thereof, all of which are within the scope of the present invention.

[0258] As can be seen from the above-mentioned embodiments, in accordance with embodiment 7, by scrambling the CRC of the DCI for scheduling msgB using an RNTI different from the RA-RNTI actually used in 4-step random access, it is possible to avoid confusion of RNTI in 2-step random access. In other words, it is possible to avoid a user equipment in 2-step random access mistaking msgB or Msg2 not for its RO for msgB for its RO, and it is also possible to avoid a user equipment in 4-step random access mistaking msgB not for its RO for Msg2 for its RO.

[0259] Also, in accordance with Example 8, by placing restrictions on the msg1-FDM parameter, the value of the first RNIT can be made to be equal to or less than the maximum value of all possible values ​​of the RA-RNTI for 4-step random access, and confusion over the RNTI in 2-step random access can also be avoided. EXAMPLES

[0260] In an embodiment of the present invention, a network device is provided, and the network device includes a device for sending a random access response in two-step random access according to an embodiment 9 or 10.

[0261] Figure 31 is a configuration diagram of a network device according to embodiment 12 of the present invention. As shown in Figure 31, the network device 3100 may include a processor 3110 and a memory 3120, and the memory 3120 is connected to the processor 3110. The memory 3120 can store various data, and can also store a program 3130 for information processing, and can execute the program 3130 under the control of the processor 3110 to receive various information transmitted by a user device and transmit various information to the user device.

[0262] In one implementation, the function of the device sending a random access response in two-step random access can be integrated into the processor 3110.

[0263] Corresponding to embodiment 9, the processor 3110 may be configured as follows: calculate a first RNTI, where the first RNTI is different from the RA-RNTI actually used in the four-step random access; use the first RNTI to scramble a cyclic redundancy check (CRC) of downlink control information for scheduling a random access response; and transmit the downlink control information and the random access response.

[0264] Corresponding to embodiment 10, the processor 3110 may be configured as follows: calculate a first RNTI, where the value of the first RNTI is less than or equal to the maximum value of all possible values ​​of RA-RNTI for four-step random access; use the first RNTI to scramble a cyclic redundancy check of downlink control information for scheduling a random access response; and transmit the downlink control information and the random access response.

[0265] In another implementation method, the device for sending a random access response in two-step random access may be arranged separately from the processor 3110, for example, the device for sending a random access response in two-step random access may be configured as a chip connected to the processor 3110, and the function of the device for sending a random access response in two-step random access may be realized under the control of the processor 3110.

[0266] Also, as shown in Fig. 31, the network device 3100 may further include a transceiver 3140, an antenna 3150, etc., among which the functions of these components are similar to those of the prior art, and detailed description thereof will be omitted here. Note that the network device 3100 does not need to include all the components shown in 31, and the network device 3100 may further include components not shown in Fig. 31, but the prior art can be referred to for this.

[0267] As can be seen from the above-mentioned embodiments, in accordance with embodiment 9, by scrambling the CRC of the DCI for scheduling msgB using an RNTI different from the RA-RNTI actually used in 4-step random access, it is possible to avoid confusion of RNTI in 2-step random access. In other words, it is possible to avoid a user equipment with 2-step random access mistaking msgB or Msg2 not for its RO for msgB for its RO, and it is also possible to avoid a user equipment with 4-step random access mistaking msgB not for its RO for Msg2 for its RO.

[0268] Also, in accordance with embodiment 10, by placing restrictions on the msg1-FDM parameter, the value of the first RNIT can be made to be less than or equal to the maximum value of all possible values ​​of the RA-RNTI for four-step random access, and confusion over the RNTI in two-step random access can also be avoided. EXAMPLES

[0269] In an embodiment of the present invention, a communication system is provided, which includes a user equipment according to an eleventh embodiment and / or a network equipment according to a twelfth embodiment.

[0270] For example, the configuration of the communication system can be referred to in FIG. 3. As shown in FIG. 3, the communication system 100 includes a network device 101 and a user device 102, the user device 102 is the same as the user device described in Example 11, and the network device 101 is the same as the network device described in Example 12, and duplicated content is omitted.

[0271] As can be seen from the above embodiment, by scrambling the CRC of the DCI that schedules msgB using an RNTI different from the RA-RNTI actually used in 4-step random access, it is possible to avoid confusion of RNTI in 2-step random access. In other words, it is possible to avoid a user equipment with 2-step random access mistaking msgB or Msg2 that is not for its RO for msgB for its RO, and it is also possible to avoid a user equipment with 4-step random access mistaking msgB that is not for its RO for Msg2 for its RO.

[0272] The above-mentioned devices and methods may be realized by software or hardware, or may be realized by a combination of hardware and software. The present invention further relates to a computer-readable program, which, when executed by a logic component, causes the logic component to realize the above-mentioned devices or components, or causes the logic component to realize the above-mentioned various methods or steps. The logic component may be, for example, an FPGA (Field Programmable Gate Array), a microprocessor, a processor for use in a computer, etc. The present invention further relates to a storage medium, such as a hard disk, a magnetic disk, an optical hard disk, a DVD, a flash memory, etc., storing the above-mentioned program.

[0273] Additionally, one or more combinations of the functional blocks depicted in the figures and / or one or more combinations of the functional blocks may be implemented as a general purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic component, a discrete gate or transistor logic component, a discrete hardware assembly, or any other suitable combination for performing the functions described herein. Also, one or more combinations of the functional blocks depicted in the figures and / or one or more combinations of the functional blocks may be further configured as a combination of computing devices, such as a combination of a DSP and a microprocessor, a combination of multiple microprocessors, one or more microprocessors in communication with a DSP, or any other configuration.

[0274] Although the preferred embodiments of the present invention have been described above, the present invention is not limited to such embodiments, and any modifications to the present invention fall within the technical scope of the present invention as long as they do not depart from the spirit of the present invention.

[0275] Furthermore, with respect to the above-mentioned embodiments, the following supplementary notes are disclosed.

[0276] (Appendix 1) An apparatus for receiving a random access response in two-step random access, the apparatus being applied to a user equipment side, the apparatus comprising: a first calculation unit for calculating a first RNTI, where the first RNTI is different from the RA-RNTI actually used in four-step random access; a first detection unit that detects, within a monitoring window, downlink control information (DCI) that schedules a random access response using the first RNTI; and a first receiving unit that, upon successfully detecting the downlink control information, receives a random access response on a physical downlink shared channel (PDSCH) based on the downlink control information;

[0277] (Appendix 2) 2. The apparatus of claim 1, The first calculation unit calculates the first RNTI based on a second RNTI and an offset.

[0278] (Appendix 3) 2. The apparatus of claim 1, The first RNTI includes a third RNTI and / or a fourth RNTI; The first computing unit: a second calculation unit for calculating the third RNTI based on the fifth RNTI and the first offset; and / or a third calculation unit for calculating the fourth RNTI based on the fifth RNTI, the first offset, and the second offset; The first detection unit is a second detection unit for detecting a first downlink control information scheduling a first random access response using the third RNTI within a monitoring window; and / or and a third detection unit for detecting, within a monitoring window, second downlink control information scheduling a second random access response using the fourth RNTI.

[0279] (Appendix 4) 4. The apparatus of claim 2 or 3, At least one of the offset, the first offset, and the second offset is configured by a network device using at least one of the following: Broadcast messages; RRC signaling; and A device that is a MAC CE (MAC control element).

[0280] (Appendix 5) 4. The apparatus of claim 2 or 3, The offset or the first offset is greater than or equal to a value determined based on one of the following: The numerical range of the RA-RNTI; The RA-RNTI value range and secondary carrier configuration information; the numerical range of the RA-RNTI, configuration information of a second carrier, and first PRACH configuration information of a four-step random access on the second carrier; an apparatus, the second carrier configuration information, the second PRACH configuration information of the four-step random access on the second carrier, and the second PRACH configuration information of the four-step random access on the first carrier; (Appendix 6) 6. The apparatus of claim 5, The second offset is greater than or equal to a value determined based on one of the following: A numerical range for the fifth RNTI; configuration information of the fifth RNTI value range and the second carrier; the value range of the fifth RNTI, configuration information of a second carrier, and first PRACH configuration information of two-step random access on the second carrier; and The device includes configuration information of a second carrier, second PRACH configuration information of two-step random access on the second carrier, and second PRACH configuration information of two-step random access on the first carrier.

[0281] (Appendix 7) 4. The apparatus of claim 2 or 3, The offset or the first offset is one or more of the following values: the maximum of all possible values ​​of the RA-RNTI; the maximum value among all possible values ​​of the RA-RNTI for which a condition is satisfied that the index of the uplink carrier used for transmitting the preamble is zero; the maximum value among all possible values ​​of the RA-RNTI for which the condition that the index of the frequency resource in which the RO is located is equal to the index of the frequency resource corresponding to the maximum RA-RNTI actually used is satisfied; and The device,wherein the RA-RNTI is the largest one actually used.

[0282] (Appendix 8) 8. The apparatus of claim 7, further comprising: The second offset is one or more of the following values: the maximum of all possible values ​​of said fifth RNTI; the maximum value among all possible values ​​of the fifth RNTI for which a condition is satisfied that the index of the uplink carrier used for transmitting the preamble is zero; the maximum value among all possible values ​​of the fifth RNTI for which the condition that the index of the frequency resource in which the RO is located is equal to the index of the frequency resource corresponding to the maximum fifth RNTI actually used is satisfied; and The fifth RNTI is the largest RNTI actually used by the device.

[0283] (Appendix 9) 4. The apparatus of claim 2 or 3, The second RNTI or the fifth RNTI is determined based on an index of a first symbol in which an RO of a two-step random access is located, an index in one system frame of a first slot in which the RO is located, an index of a frequency resource in which the RO is located, an index of an uplink carrier used for transmitting a preamble, a system frame index, and a maximum monitoring window length corresponding to a subcarrier spacing; The second RNTI or the fifth RNTI is determined based on an index of a first symbol in which the RO of the two-step random access is located, an index in one system frame of the first slot in which the RO is located, an index of a frequency resource in which the RO is located, an index of an uplink carrier used for transmitting a preamble, a system frame index, and a maximum monitoring window length; or The second RNTI or the fifth RNTI is determined based on an index of a first symbol in which a two-step random access RO is located, an index of a first slot in one system frame in which the RO is located, an index of a frequency resource in which the RO is located, and an index of an uplink carrier used to transmit a preamble.

[0284] (Appendix 10) 10. The apparatus of claim 9, further comprising: When two-step random access and four-step random access share an RO and / or the maximum monitoring window length is less than or equal to 10 milliseconds, the fifth RNTI is determined based on an index of a first symbol in which the two-step random access RO is located, an index of a first slot in one system frame in which the RO is located, an index of a frequency resource in which the RO is located, and an index of an uplink carrier used to transmit a preamble, and the first offset is equal to zero.

[0285] (Appendix 11) 10. The apparatus of claim 9, further comprising: Make sure that 10240 is divisible by the maximum monitoring window length in milliseconds.

[0286] (Appendix 12) 2. The apparatus of claim 1, When a slot or a symbol in which a uplink shared channel is present is unavailable and a slot or a symbol in which a preamble associated with the uplink shared channel is present is available, an apparatus, wherein two-step random access allows transmitting a preamble using a slot or symbol in which a preamble associated with the uplink shared channel is located, and the monitoring window is located after the slot or symbol in which the uplink shared channel is located, or wherein two-step random access does not allow transmitting a preamble using a slot or symbol in which a preamble associated with the uplink shared channel is located.

[0287] (Appendix 13) An apparatus for receiving a random access response in two-step random access, the apparatus being applied to a user equipment side, the apparatus comprising: a fourth calculation unit for calculating a first RNTI, where the value of the first RNTI is less than or equal to a maximum value of all possible values ​​of RA-RNTI for four-step random access; a fourth detection unit for detecting downlink control information scheduling a random access response using the first RNTI within a monitoring window; and a second receiving unit for receiving a random access response on a physical downlink shared channel based on the downlink control information upon successfully detecting the downlink control information.

[0288] (Appendix 14) 14. The apparatus of claim 13, further comprising: the fourth calculation unit calculates the first RNTI based on a second RNTI and an offset; the offset is determined according to the configuration information of a second carrier, the second PRACH configuration information of four-step random access on the second carrier, and the second PRACH configuration information of four-step random access on the first carrier, and a sum of the msg1-FDM parameter in the PRACH resource configuration of four-step random access of a carrier and the msg1-FDM parameter in the PRACH resource configuration of two-step random access of the same carrier is less than or equal to 8.

[0289] (Appendix 15) 14. The apparatus of claim 13, further comprising: The first RNTI includes a third RNTI and a fourth RNTI, and the values ​​of the third RNTI and the fourth RNTI are each equal to or less than a maximum value among all possible values ​​of RA-RNTI for 4-step random access; The fourth computing unit: a fifth calculation unit for calculating the third RNTI based on the fifth RNTI and the first offset; and / or a sixth calculation unit that calculates the fourth RNTI based on the fifth RNTI, the first offset, and the second offset; the first offset is equal to or greater than a value determined based on configuration information of a second carrier, a second PRACH configuration information of a four-step random access on the second carrier, and a second PRACH configuration information of a four-step random access on the first carrier; the second offset is equal to or greater than a value determined based on configuration information of a second carrier, a second PRACH configuration information of a two-step random access on the second carrier, and a second PRACH configuration information of a two-step random access on the first carrier; and a sum of a msg1-FDM parameter in a PRACH resource configuration of a four-step random access of a carrier and twice the msg1-FDM parameter in a PRACH resource configuration of a two-step random access of the same carrier is equal to or less than 8.

[0290] (Appendix 16) An apparatus for transmitting a random access response in two-step random access, the apparatus being applied to a network device side, the apparatus comprising: a seventh calculation unit for calculating a first RNTI, where the first RNTI is different from the RA-RNTI actually used in the four-step random access; a first scrambling unit for scrambling a cyclic redundancy check (CRC) of downlink control information for scheduling a random access response using the first RNTI; and An apparatus comprising: a first transmission unit for transmitting the downlink control information and the random access response.

[0291] (Appendix 17) 17. The apparatus of claim 16, further comprising: The seventh calculation unit calculates the first RNTI based on a second RNTI and an offset.

[0292] (Appendix 18) 17. The apparatus of claim 16, further comprising: The first RNTI includes a third RNTI and / or a fourth RNTI; The seventh computing unit: an eighth calculation unit for calculating the third RNTI based on the fifth RNTI and the first offset; and / or a ninth calculation unit that calculates the fourth RNTI based on the fifth RNTI, the first offset, and the second offset; The device, wherein the first scrambling unit scrambles a cyclic redundancy check of first downlink control information for scheduling a random access response using the third RNTI and / or scrambles a cyclic redundancy check of second downlink control information for scheduling a random access response using the fourth RNTI.

[0293] (Appendix 19) 19. The apparatus of claim 17 or 18, The apparatus further comprises: a setting unit for setting at least one of the offset, the first offset and the second offset according to at least one of the following: Broadcast messages; RRC signaling; and A device that is a MAC CE (MAC control element).

[0294] (Appendix 20) 19. The apparatus of claim 17 or 18, The offset or the first offset is greater than or equal to a value determined based on one of the following: The numerical range of the RA-RNTI; The RA-RNTI value range and secondary carrier configuration information; the value range of the RA-RNTI, configuration information of the second carrier, and first PRACH configuration information of the four-step random access on the second carrier; and The device includes configuration information of a second carrier, second PRACH configuration information of a four-step random access on the second carrier, and second PRACH configuration information of a four-step random access on the first carrier.

[0295] (Appendix 21) 21. The apparatus of claim 20, further comprising: The second offset is greater than or equal to a value determined based on one of the following: A numerical range for the fifth RNTI; configuration information of the fifth RNTI value range and the second carrier; the value range of the fifth RNTI, configuration information of a second carrier, and first PRACH configuration information of two-step random access on the second carrier; and The device includes configuration information of a second carrier, second PRACH configuration information of two-step random access on the second carrier, and second PRACH configuration information of two-step random access on the first carrier.

[0296] (Appendix 22) 19. The apparatus of claim 17 or 18, The offset or the first offset is one or more of the following values: the maximum of all possible values ​​of the RA-RNTI; the maximum value among all possible values ​​of the RA-RNTI for which a condition is satisfied that the index of the uplink carrier used for transmitting the preamble is zero; the maximum value among all possible values ​​of the RA-RNTI for which the condition that the index of the frequency resource in which the RO is located is equal to the index of the frequency resource corresponding to the maximum RA-RNTI actually used is satisfied; and The device,wherein the RA-RNTI is the largest one actually used.

[0297] (Appendix 23) 23. The apparatus of claim 22, further comprising: The second offset is one or more of the following values: the maximum of all possible values ​​of said fifth RNTI; the maximum value among all possible values ​​of the fifth RNTI for which a condition is satisfied that the index of the uplink carrier used for transmitting the preamble is zero; the maximum value among all possible values ​​of the fifth RNTI for which the condition that the index of the frequency resource in which the RO is located is equal to the index of the frequency resource corresponding to the maximum fifth RNTI actually used is satisfied; and The fifth RNTI is the largest RNTI actually used by the device.

[0298] (Appendix 24) 19. The apparatus of claim 17 or 18, The second RNTI or the fifth RNTI is determined according to an index of a first symbol in which an RO of a two-step random access is located, an index in one system frame of a first slot in which the RO is located, an index of a frequency resource in which the RO is located, an index of an uplink carrier used for transmitting a preamble, a system frame index, and a maximum monitoring window length corresponding to a subcarrier spacing; The second RNTI or the fifth RNTI is determined based on an index of a first symbol in which the RO of the two-step random access is located, an index in one system frame of the first slot in which the RO is located, an index of a frequency resource in which the RO is located, an index of an uplink carrier used for transmitting a preamble, a system frame index, and a maximum monitoring window length; or The second RNTI or the fifth RNTI is determined based on an index of a first symbol in which an RO of a two-step random access is located, an index of a first slot in one system frame in which the RO is located, an index of a frequency resource in which the RO is located, and an index of an uplink carrier used to transmit a preamble.

[0299] (Appendix 25) 25. The apparatus of claim 24, When two-step random access and four-step random access share an RO and / or a maximum monitoring window length is less than or equal to 10 milliseconds, the fifth RNTI is determined based on an index of a first symbol in which the two-step random access RO is located, an index of a first slot in one system frame in which the two-step random access RO is located, an index of a frequency resource in which the two-step random access RO is located, and an index of an uplink carrier used to transmit a preamble, and the first offset is equal to zero. (Appendix 26) 25. The apparatus of claim 24, A device where 10240 is divisible by the maximum monitoring window length in milliseconds.

[0300] (Appendix 27) 17. The apparatus of claim 16, further comprising: When a slot or a symbol in which a uplink shared channel is present is unavailable and a slot or a symbol in which a preamble associated with the uplink shared channel is present is available, an apparatus, wherein two-step random access allows transmitting a preamble using a slot or symbol in which a preamble associated with the uplink shared channel is located, and the monitoring window is located after the slot or symbol in which the uplink shared channel is located, or wherein two-step random access does not allow transmitting a preamble using a slot or symbol in which a preamble associated with the uplink shared channel is located.

[0301] (Appendix 28) An apparatus for sending a random access response in two-step random access is provided, the apparatus being applied to a network device side, the apparatus comprising: a tenth calculation unit for calculating a first RNTI, where the value of the first RNTI is less than or equal to a maximum value of all possible values ​​of RA-RNTI for four-step random access; a second scrambling unit for scrambling a cyclic redundancy check of downlink control information for scheduling a random access response using the first RNTI; and A second transmission unit for transmitting the downlink control information and the random access response.

[0302] (Appendix 29) 29. The apparatus of claim 28, further comprising: the tenth calculation unit calculates the first RNTI based on a second RNTI and an offset; the offset is greater than or equal to a value determined based on the configuration information of a second carrier, the second PRACH configuration information of a 4-step random access on the second carrier, and the second PRACH configuration information of a 4-step random access on the first carrier, and the sum of the msg1-FDM parameter in the PRACH resource configuration of a 4-step random access of a carrier and the msg1-FDM parameter in the PRACH resource configuration of a 2-step random access of the same carrier is less than or equal to 8.

[0303] (Appendix 30) 29. The apparatus of claim 28, further comprising: The first RNTI includes a third RNTI and a fourth RNTI, and the values ​​of the third RNTI and the fourth RNTI are each equal to or less than a maximum value among all possible values ​​of RA-RNTI for 4-step random access; The tenth computing unit: an eleventh calculation unit for calculating the third RNTI based on the fifth RNTI and the first offset; and / or a twelfth calculation unit that calculates the fourth RNTI based on the fifth RNTI, the first offset, and the second offset; the first offset is equal to or greater than a value determined based on configuration information of a second carrier, a second PRACH configuration information of a four-step random access on the second carrier, and a second PRACH configuration information of a four-step random access on the first carrier; the second offset is equal to or greater than a value determined based on configuration information of a second carrier, a second PRACH configuration information of a two-step random access on the second carrier, and a second PRACH configuration information of a two-step random access on the first carrier; and a sum of a msg1-FDM parameter in a PRACH resource configuration of a four-step random access of a carrier and twice the msg1-FDM parameter in a PRACH resource configuration of a two-step random access of the same carrier is equal to or less than 8.

[0304] (Appendix 31) A user device, The user device includes a device according to any one of claims 1-15.

[0305] (Appendix 32) A network device, The network device may include a device according to any one of claims 16-30.

[0306] (Appendix 33) 1. A communication system comprising: A communication system comprising a user equipment according to claim 31 and / or a network equipment according to claim 32.

Claims

1. A transmitter capable of transmitting a random access preamble and an uplink shared channel associated with the random access preamble; a control unit that determines a first Radio Network Temporary Identity (RNTI) and controls the monitoring window to start from a slot or a symbol following a symbol in which the uplink shared channel is located; a receiving unit configured to detect downlink control information for scheduling a random access response using the first RNTI within the monitoring window, and to receive a random access response on a physical downlink shared channel (PDSCH) in response to the downlink control information; The control unit controls so as not to change a position of the monitoring window even when the transmission unit transmits the random access preamble without transmitting the uplink shared channel. Terminal device.

2. The first RNTI is different from the RA-RNTI (Random Access-Radio Network Temporary Identity) calculated in the four-step random access procedure. The terminal device according to claim 1 .

3. The first RNTI is a Random Access-Radio Network Temporary Identity (RA-RNTI) calculated in a two-step random access procedure. The terminal device according to claim 1 .

4. The control unit calculates the first RNTI according to a second RNTI corresponding to the random access preamble and an offset value to which a predetermined value is added. The terminal device according to claim 2 or 3.

5. The second RNTI is determined based on an index of a first symbol in which a two-step random access RO (RACH Occasion) is located, an index of a first slot in which the two-step random access RO is located in one system frame, an index of a frequency resource in which the two-step random access RO is located, an index of an uplink carrier used for transmitting a preamble, an index of a system frame, and a maximum monitoring window length corresponding to a subcarrier spacing; The terminal device according to claim 4.

6. the offset value is greater than or equal to the maximum of all possible values ​​of the RA-RNTI; The terminal device according to claim 4.

7. A receiver capable of receiving a random access preamble and an uplink shared channel associated with the random access preamble; A control unit that determines a first Radio Network Temporary Identity (RNTI); a transmitter that transmits downlink control information for scheduling a random access response using the first RNTI within a monitoring window starting from a symbol after a slot or symbol in which the uplink shared channel is located, and transmits the random access response on a physical downlink shared channel (PDSCH) in response to the downlink control information; The control unit controls so as not to change a position of the monitoring window even when the receiving unit receives the random access preamble without receiving the uplink shared channel. Base station equipment.

Images