Random Access Procedure Technology

Abstract

A technique for performing random access is described. An example of a wireless communication method includes receiving, by a communication device, a control information format indicating to initiate a random access procedure associated with a transmission parameter, performing, by the communication device, a random access channel (RACH) transmission in response to receiving the control information format, receiving, in response to the RACH transmission, a control channel with a cyclic redundancy check (CRC) scrambled by a radio network temporary identifier (RNTI), the RNTI being associated with the RACH transmission, and receiving, by the communication device, a shared channel scheduled by the RNTI, where the control channel and the shared channel are received during a random access response window defined according to a rule.

Description

[Technical Field]

[0001] This document relates generally to digital wireless communications. [Background technology]

[0002] Mobile communication technologies are moving the world towards an increasingly connected and networked society. Compared to existing wireless networks, next-generation systems and wireless communication technologies will need to support a much wider range of use case characteristics and provide a more complex and sophisticated range of access requirements and flexibility.

[0003] Long Term Evolution (LTE) is a wireless communication standard for mobile devices and data terminals developed by the 3rd Generation Partnership Project (3GPP®). LTE-A is a wireless communication standard that enhances the LTE standard. The fifth-generation wireless system, known as 5G, evolves the LTE and LTE-A wireless standards and is dedicated to supporting higher data rates, a large number of connections, ultra-low latency, high reliability, and other emerging business needs. Summary of the Invention [Means for solving the problem]

[0004] Techniques for a random access procedure (such as when the random access procedure is triggered by a downlink control information (DCI) format for a physical downlink control channel (PDCCH) order) are disclosed. Some example techniques include a user equipment (UE) determining a random access response window, a UE determining a quasi-co-location characteristic, a UE determining a PRACH transmit power when a random access response (RAR) is not received, a UE determining a cell radio network temporary identifier (C-RNTI) based on a message from the network, and / or a UE determining when and / or how to drop a timing advance value.

[0005] A first wireless communication method includes receiving, by a communication device, a control information format indicating that a random access procedure associated with transmission parameters should be initiated; performing, by the communication device, a random access channel (RACH) transmission in response to receiving the control information format; receiving, in response to the RACH transmission, a control channel with a cyclic redundancy check (CRC) scrambled by a radio network temporary identifier (RNTI), the RNTI being associated with the RACH transmission; and receiving, by the communication device, a shared channel scheduled by the RNTI, the control channel and the shared channel being received during a random access response window defined in accordance with a rule.

[0006] In some embodiments, the rule specifies that the random access response window starts at a symbol based on any one or more of: (1) the first symbol of an earliest control resource set (CORESET) at which the communications device is configured to receive control channels for a Type 1-PDCCH common search space (CSS) set, the Type 1-PDCCH CSS set being configured for a serving cell or a transmission parameter; (2) an offset value for the transmission parameter, the offset value indicating a number of symbols or a number of slots; (3) an indication field of a control information format for a physical downlink control channel (PDCCH) order triggering a random access procedure, the indication field indicating a number of milliseconds, a number of symbols, or a number of slots; or (4) the first symbol or the last symbol of a RACH transmission. In some embodiments, the rules provide that the length of the random access response window is based on any one or more of: (1) another length of the random access response window configured for the serving cell or corresponding transmission parameters; (2) an offset value for the transmission parameters, the offset value indicating a number of milliseconds; or (3) an indication field of a control information format for a physical downlink control channel (PDCCH) order triggering the random access procedure, the indication field indicating a number of milliseconds.

[0007] In some embodiments, the rules provide that the random access response window is based on a configured set of values ​​or combination of values ​​associated with a starting point of the random access response window and / or a length of the random access response window, the configured set of values ​​being configured by a radio resource control (RRC) message, a codepoint of an indication field of a control information format for a physical downlink control channel (PDCCH) order triggering the random access procedure, the codepoint being mapped to a value or combination of values ​​in the configured set of values. In some embodiments, the control information format includes a downlink control information (DCI) format, the control channel is a physical downlink control channel (PDCCH), and the shared channel is a physical downlink shared channel (PDSCH).

[0008] In some embodiments, the method further includes receiving, by the communications device, a physical downlink control channel (PDCCH) order associated with a first transmission parameter using a first quasi-co-location (QCL) characteristic of a reference signal port; and receiving, by the communications device, the channel using a second QCL characteristic of the reference signal port in response to at least one of: (1) first information or a first identification of the first transmission parameter for receiving the PDCCH order being different from second information or a second identification of a second transmission parameter indicated by an indication field in the PDCCH order; or (2) first information or a first identification of the first transmission parameter for receiving the PDCCH order being different from third information or a third identification of the transmission parameter for receiving the channel. In some embodiments, the second QCL characteristics of the reference signal port for receiving the channel are the same as the characteristics of the synchronization signal block (SSB) or channel state information reference signal (CSI-RS) used to perform the RACH transmission, and the channel is a physical downlink control channel (PDCCH) scrambled with the RNTI, or the channel is a physical downlink shared channel (PDSCH) scheduled with the RNTI.

[0009] In some embodiments, the second QCL characteristics of the reference signal port for receiving the channel are the same as the characteristics of a control resource set (CORESET) associated with a Type 1 physical downlink control channel (PDCCH) common search space (CSS) set, and the channel is a physical downlink control channel (PDCCH) scrambled with the RNTI. In some embodiments, the second QCL characteristics of the reference signal port for receiving the channel are the same as the characteristics of the physical downlink control channel (PDCCH) scrambled with the RNTI, and the channel is a physical downlink shared channel (PDSCH) scheduled with the RNTI. In some embodiments, the reference signal port includes a demodulation reference signal (DM-RS) port. In some embodiments, the method further includes receiving, by the communications device, a physical downlink control channel (PDCCH) order associated with a first transmission parameter using a first quasi-co-location (QCL) characteristic of a reference signal port; and receiving, by the communications device, the channel using a second QCL characteristic of the reference signal port in response to at least one of: (1) first information or a first identification of the first transmission parameter for receiving the PDCCH order being different from second information or a second identification of a second transmission parameter indicated by an indication field in the PDCCH order; or (2) first information or a first identification of the first transmission parameter for receiving the PDCCH order being the same as third information or a third identification of the transmission parameter for receiving the channel.

[0010] In some embodiments, the second QCL characteristics of the reference signal port for receiving the channel are the same as the characteristics of a control resource set (CORESET) associated with a Type 1 physical downlink control channel (PDCCH) common search space (CSS) set, and the channel is a physical downlink control channel (PDCCH) scrambled with the RNTI. In some embodiments, the second QCL characteristics of the reference signal port for receiving the channel are the same as the characteristics of a physical downlink control channel (PDCCH) scrambled with the RNTI, and the channel is a physical downlink shared channel (PDSCH) scheduled with the RNTI. In some embodiments, the second QCL characteristics of the reference signal port for receiving the channel are the same as the characteristics of a control resource set (CORESET) associated with receiving a PDCCH order, and the channel is a physical downlink shared channel (PDSCH) scrambled with the RNTI.

[0011] In some embodiments, the reference signal port includes a demodulation reference signal (DM-RS) port. In some embodiments, the method further includes receiving, by the communications device, a configuration or an indication of whether to receive a random access response (RAR), and performing, in response to receiving the configuration or the indication, any one or more of the following actions: determining that a random access procedure in response to transmission of the random access preamble is completed; a random access response window is not started by a medium access control (MAC) entity of the communications device; or a physical downlink control channel (PDCCH) is not monitored by a MAC entity in the RAR identified by the corresponding RNTI.

[0012] In some embodiments, the method further includes adjusting a random access channel (RACH) target receive power or a power at which a RACH transmission is performed during the random access procedure in response to receiving a control information format indicating that a random access procedure should be initiated, the adjustment being performed based on at least one of (1) a fixed power adjustment parameter, a predefined power adjustment parameter, or a configured power adjustment parameter, or (2) an indication field included in the control information format, the indication field indicating a count indication, a toggle flag, or a power control command. In some embodiments, the method further includes receiving, by the communication device, a cell switch command message or a random access response (RAR) including an indication field indicating a second RNTI, and performing transmission or reception by applying the second RNTI indicated in the indication field, applying the second RNTI based on an offset value associated with the second RNTI indicated in the indication field, and applying the second RNTI associated with the transmission parameter indicated in the indication field.

[0013] In some embodiments, a configuration regarding an association between a second RNTI and a transmission parameter is received by the communication device. In some embodiments, the second RNTI is a Cell Radio Network Temporary Identifier (C-RNTI) or a Temporary Cell Radio Network Temporary Identifier (TC-RNTI). In some embodiments, the method further includes receiving, by the communication device, a timing advance-related message associated with the transmission parameter based on receiving a Random Access Response (RAR), and determining, by the communication device, a Timing Advance (TA) value associated with the transmission parameter. In some embodiments, the method further includes receiving, by the communication device, a Medium Access Control Element (MAC CE) indicating a plurality of transmission parameters, wherein a first total number of the plurality of transmission parameters or a second total number of one or more unique transmission parameters in the plurality of transmission parameters is less than or equal to a total number of TA values ​​that the communication device can store, and storing, by the communication device, the TA value associated with the transmission parameter indicated by the MAC CE.

[0014] In some embodiments, the method further includes receiving, by the communications device, a deactivation medium access control element (MAC CE) indicating one or more transmission parameters to be deactivated, and deleting one or more TA values ​​associated with the one or more transmission parameters in response to receiving the deactivation MAC CE. In some embodiments, the method further includes performing a TA-related operation in response to the number of TA values ​​stored in the communications device being equal to a total number of TA values ​​storable by the communications device and no timing advance (TA) value for the transmission parameter being stored by the communications device, the TA-related operation including deleting a second TA value stored in the communications device at an earliest time relative to one or more other TA values ​​stored in the communications device, and storing the TA value after the deletion.

[0015] In some embodiments, the transmission parameters include any one or more of information grouping one or more reference signals, a reference signal resource set, a physical uplink control channel (PUCCH) resource set, a search space, panel-related information, a subarray, an antenna group, an antenna port group, a group of antenna ports, a beam group, a physical cell index (PCI), transmit / receive point (TRP)-related information, a control resource set (CORESET), a CORESET pool, a transmission configuration indicator (TCI) state, a serving cell, an additional PCI, a candidate cell, a candidate cell group, a timing advance group (TAG), a UE capability value, or a UE capability set.

[0016] A second wireless communication method includes transmitting, by a network device, a control information format that indicates to the communication device to initiate a random access procedure associated with transmission parameters; receiving, by the network device, a random access channel (RACH) transmission in response to transmitting the control information format; transmitting, in response to receiving the RACH transmission, a control channel with a cyclic redundancy check (CRC) scrambled by a radio network temporary identifier (RNTI), the RNTI being associated with the RACH transmission; and transmitting, by the network device, a shared channel scheduled by the RNTI.

[0017] In some embodiments, the control information format includes an indication field for indicating to the communication device to adjust a random access channel (RACH) target receive power or a power at which RACH transmission is performed during the random access procedure, the indication field indicating a count indication, a toggle flag, or a power control command. In some embodiments, the method further includes transmitting, by the network device, a cell switch command message or a random access response (RAR) including an indication field indicating the second RNTI. In some embodiments, a configuration regarding an association between the second RNTI and transmission parameters is transmitted by the network device. In some embodiments, the second RNTI is a Cell Radio Network Temporary Identifier (C-RNTI) or a Temporary Cell Radio Network Temporary Identifier (TC-RNTI).

[0018] In some embodiments, the method further includes transmitting, by the network device, a timing advance-related message associated with the transmission parameters based on the transmission of the random access response (RAR). In some embodiments, the method further includes transmitting, by the network device, a medium access control control element (MAC CE) indicating the plurality of transmission parameters, wherein a first total number of the plurality of transmission parameters or a second total number of the one or more unique transmission parameters in the plurality of transmission parameters is less than or equal to a total number of TA values ​​that the communication device can store. In some embodiments, the method further includes transmitting, by the network device, a deactivation medium access control control element (MAC CE) indicating one or more transmission parameters to be deactivated. In some embodiments, the transmission parameters include any one or more of information grouping one or more reference signals, a reference signal resource set, a physical uplink control channel (PUCCH) resource set, a search space, panel-related information, a subarray, an antenna group, an antenna port group, a group of antenna ports, a beam group, a physical cell index (PCI), transmit / receive point (TRP)-related information, a control resource set (CORESET), a CORESET pool, a transmission configuration indicator (TCI) state, a serving cell, an additional PCI, a candidate cell, a candidate cell group, a timing advance group (TAG), a UE capability value, or a UE capability set.

[0019] In yet another exemplary aspect, the foregoing methods are embodied in the form of processor-executable code and stored in a non-transitory computer-readable storage medium, the code contained on the computer-readable storage medium, when executed by a processor, causing the processor to perform the methods described in this patent document.

[0020] In yet another exemplary embodiment, a device configured (or operable) to perform the aforementioned method is disclosed.

[0021] These and other aspects and their implementations are described in more detail in the figures, description, and claims. The present invention provides, for example, the following. (Item 1) 1. A wireless communication method, the method comprising: receiving, by the communication device, a control information format indicating that a random access procedure associated with transmission parameters should be initiated; performing, by the communication device, a random access channel (RACH) transmission in response to receiving the control information format; receiving, in response to the RACH transmission, a control channel with a cyclic redundancy check (CRC) scrambled with a radio network temporary identifier (RNTI), the RNTI being associated with the RACH transmission; and receiving, by the communication device, a shared channel scheduled by the RNTI; Including, The method, wherein the control channel and the shared channel are received during a random access response window defined according to a rule. (Item 2) The said rule is: (1) a first symbol of an earliest control resource set (CORESET) on which the communication device is configured to receive the control channel for a Type 1-PDCCH common search space (CSS) set, the Type 1-PDCCH CSS set being configured for a serving cell or the transmission parameters; (2) an offset value for the transmission parameter, the offset value indicating a number of symbols or a number of slots; (3) an indication field of the control information format for a physical downlink control channel (PDCCH) order that triggers the random access procedure, the indication field indicating a number of milliseconds, a number of symbols, or a number of slots; or (4) First or last symbol of RACH transmission Item 1, wherein the random access response window starts at a symbol based on any one or more of: (Item 3) The said rule is: (1) a different length of the random access response window configured for the serving cell or corresponding transmission parameters; (2) an offset value for the transmission parameter, the offset value indicating a number of milliseconds; (3) an indication field of the control information format for a physical downlink control channel (PDCCH) order that triggers the random access procedure, the indication field indicating a number of milliseconds; 2. The method of claim 1, wherein the length of the random access response window is based on one or more of: (Item 4) The said rule is: a configured set of values ​​or a combination of values ​​associated with the starting point of the random access response window and / or the length of the random access response window, the configured set of values ​​being configured by a Radio Resource Control (RRC) message; a codepoint of an indication field of the control information format for a physical downlink control channel (PDCCH) order that triggers the random access procedure, the codepoint being mapped to a value or combination of values ​​within the configured set of values; 2. The method of claim 1, wherein the random access response window is based on (Item 5) 5. The method according to any one of claims 1 to 4, wherein the control information format includes a downlink control information (DCI) format, the control channel is a physical downlink control channel (PDCCH), and the shared channel is a physical downlink shared channel (PDSCH). (Item 6) receiving, by the communication device, a physical downlink control channel (PDCCH) order associated with a first transmission parameter using a first quasi-co-location (QCL) characteristic of a reference signal port; by the communication device (1) the first information or first identification of the first transmission parameter for receiving the PDCCH order is different from the second information or second identification of the second transmission parameter indicated by an indication field in the PDCCH order; or (2) The first information or the first identification of the first transmission parameter for receiving the PDCCH order is different from the third information or the third identification of the transmission parameter for receiving the channel. receiving a channel using a second QCL characteristic of the reference signal port in response to at least one of Item 1, the method of claim 1 further comprising: (Item 7) the second QCL characteristics of the reference signal port for receiving the channel are the same as characteristics of a synchronization signal block (SSB) or a channel state information reference signal (CSI-RS) used to perform the RACH transmission; 7. The method of claim 6, wherein the channel is a physical downlink control channel (PDCCH) scrambled with the RNTI, or the channel is a physical downlink shared channel (PDSCH) scheduled with the RNTI. (Item 8) the second QCL characteristics of the reference signal port for receiving the channel are the same as characteristics of a control resource set (CORESET) associated with a type-1 physical downlink control channel (PDCCH) common search space (CSS) set; 7. The method of claim 6, wherein the channel is a physical downlink control channel (PDCCH) scrambled with the RNTI. (Item 9) The second QCL characteristic of the reference signal port for receiving the channel is the same as a characteristic of a physical downlink control channel (PDCCH) scrambled with the RNTI; 7. The method of claim 6, wherein the channel is a physical downlink shared channel (PDSCH) scheduled in the RNTI. (Item 10) Item 7. The method of item 6, wherein the reference signal port includes a demodulation reference signal (DM-RS) port. (Item 11) receiving, by the communication device, a physical downlink control channel (PDCCH) order associated with a first transmission parameter using a first quasi-co-location (QCL) characteristic of a reference signal port; by the communication device (1) the first information or first identification of the first transmission parameter for receiving the PDCCH order is different from the second information or second identification of the second transmission parameter indicated by an indication field in the PDCCH order; or (2) The first information or the first identification of the first transmission parameter for receiving the PDCCH order is the same as the third information or the third identification of the transmission parameter for receiving the channel. receiving a channel using a second QCL characteristic of the reference signal port in response to at least one of Item 1, the method of claim 1 further comprising: (Item 12) the second QCL characteristics of the reference signal port for receiving the channel are the same as characteristics of a control resource set (CORESET) associated with a type-1 physical downlink control channel (PDCCH) common search space (CSS) set; Item 12. The method of item 11, wherein the channel is a physical downlink control channel (PDCCH) scrambled with the RNTI. (Item 13) The second QCL characteristic of the reference signal port for receiving the channel is the same as a characteristic of a physical downlink control channel (PDCCH) scrambled with the RNTI; Item 12. The method of item 11, wherein the channel is a physical downlink shared channel (PDSCH) scheduled in the RNTI. (Item 14) The second QCL characteristics of the reference signal port for receiving the channel are the same as characteristics of a control resource set (CORESET) associated with receiving the PDCCH order; and Item 12. The method of item 11, wherein the channel is a physical downlink shared channel (PDSCH) scrambled with the RNTI. (Item 15) Item 12. The method of item 11, wherein the reference signal port includes a demodulation reference signal (DM-RS) port. (Item 16) receiving, by the communications device, a configuration or indication of whether to receive a random access response (RAR); In response to receiving the configuration or the instruction, performing the following actions: determining that the random access procedure in response to transmission of the random access preamble is completed; the random access response window is not initiated by a medium access control (MAC) entity of the communication device; or A physical downlink control channel (PDCCH) is not monitored by the MAC entity in the RAR identified by the corresponding RNTI. and Item 1, the method of claim 1 further comprising: (Item 17) adjusting a random access channel (RACH) target received power, or a power at which the RACH transmission is performed during the random access procedure, in response to receiving the control information format indicating that the random access procedure should be initiated; the adjustment is performed based on at least one of (1) fixed, predefined, or configured power adjustment parameters, or (2) an indication field included in the control information format; Item 17. The method of item 16, wherein the instruction field indicates a count instruction, a toggle flag, or a power control command. (Item 18) receiving, by the communication device, a cell switch command message or a random access response (RAR) including an indication field indicating a second RNTI; by the communication device applying a second RNTI indicated in the indication field; and applying the second RNTI based on an offset value indicated in the indication field, the offset value being relative to the second RNTI; applying the second RNTI associated with the transmission parameters indicated in the indication field; and to perform transmission or reception by performing Item 1, the method of claim 1 further comprising: (Item 19) Item 19. The method of item 18, wherein a configuration regarding an association between the second RNTI and the transmission parameters is received by the communication device. (Item 20) Item 19. The method of item 18, wherein the second RNTI is a Cell Radio Network Temporary Identifier (C-RNTI) or a Temporary Cell Radio Network Temporary Identifier (TC-RNTI). (Item 21) receiving, by the communication device, a timing advance related message associated with the transmission parameters based on receipt of a random access response (RAR); determining, by the communication device, a timing advance (TA) value associated with the transmission parameter; Item 1, the method of claim 1 further comprising: (Item 22) receiving, by the communication device, a medium access control element (MAC CE) indicating a plurality of transmission parameters, wherein a first total number of the plurality of transmission parameters or a second total number of one or more unique transmission parameters in the plurality of transmission parameters is less than or equal to a total number of TA values ​​that the communication device can store; storing, by the communication device, the TA value associated with the transmission parameters indicated by the MAC CE; 22. The method of claim 21, further comprising: (Item 23) receiving, by the communication device, a deactivation medium access control element (MAC CE) indicating one or more transmission parameters to be deactivated; In response to receiving the deactivation MAC CE, deleting one or more TA values ​​associated with the one or more transmission parameters; 22. The method of claim 21, further comprising: (Item 24) the number of TA values ​​stored in the communication device is equal to the total number of TA values ​​that the communication device is capable of storing; and No timing advance (TA) value for the transmission parameter is stored by the communication device. performing a TA-related action in response to the The TA-related operation is: deleting a second TA value stored in the communication device at an earliest time relative to one or more other TA values ​​stored in the communication device; and storing the TA value after said deletion; The method according to item 1, comprising: (Item 25) The transmission parameters are: information grouping one or more reference signals; a reference signal resource set; Physical Uplink Control Channel (PUCCH) resource set; search space, Panel related information, Sub-array, Antenna Group, Antenna port group, A group of antenna ports, Beam Group, Physical Cell Index (PCI), Transmitting / receiving point (TRP) related information, Control Resource Set (CORESET), CORESET pool, Transmission Configuration Indicator (TCI) state, Serving cell, additional PCI, candidate cells, candidate cell groups, Timing Advance Group (TAG), UE ability score, or UE Capability Set 25. The method of any one of items 1 to 24, comprising any one or more of: (Item 26) 1. A wireless communication method, the method comprising: transmitting, by the network device, a control information format indicating to the communication device to initiate a random access procedure associated with the transmission parameters; receiving, by the network device, a random access channel (RACH) transmission in response to transmitting the control information format; In response to receiving the RACH transmission, transmitting a control channel with a cyclic redundancy check (CRC) scrambled by a radio network temporary identifier (RNTI), the RNTI being associated with the RACH transmission; and transmitting, by the network device, a shared channel scheduled by the RNTI; A method comprising: (Item 27) the control information format includes an instruction field for indicating to the communication device to adjust a random access channel (RACH) target received power or a power at which the RACH transmission is performed during the random access procedure; 27. The method of claim 26, wherein the instruction field indicates a count instruction, a toggle flag, or a power control command. (Item 28) 27. The method of claim 26, further comprising transmitting, by the network device, a cell switch command message or a random access response (RAR) including an indication field indicating the second RNTI. (Item 29) 29. The method of claim 28, wherein a configuration regarding an association between the second RNTI and the transmission parameters is transmitted by the network device. (Item 30) 29. The method of claim 28, wherein the second RNTI is a Cell Radio Network Temporary Identifier (C-RNTI) or a Temporary Cell Radio Network Temporary Identifier (TC-RNTI). (Item 31) 27. The method of claim 26, further comprising transmitting, by the network device, a timing advance related message associated with the transmission parameter based on transmission of a random access response (RAR). (Item 32) transmitting, by the network device, a Medium Access Control Element (MAC CE) indicating a plurality of transmission parameters; Item 32. The method of item 31, wherein the first total number of the plurality of transmission parameters or the second total number of one or more unique transmission parameters in the plurality of transmission parameters is less than or equal to the total number of TA values ​​that the communication device can store. (Item 33) 32. The method of claim 31, further comprising transmitting, by the network device, a deactivation medium access control element (MAC CE) indicating one or more transmission parameters to be deactivated. (Item 34) The transmission parameters are: information grouping one or more reference signals; a reference signal resource set; Physical Uplink Control Channel (PUCCH) resource set; search space, Panel related information, Sub-array, Antenna Group, Antenna port group, A group of antenna ports, Beam Group, Physical Cell Index (PCI), Transmitting / receiving point (TRP) related information, Control Resource Set (CORESET), CORESET pool, Transmission Configuration Indicator (TCI) state, Serving cell, additional PCI, candidate cells, candidate cell groups, Timing Advance Group (TAG), UE ability score, or UE Capability Set 34. The method of any one of items 26 to 33, comprising any one or more of: (Item 35) 35. An apparatus for wireless communication comprising a processor configured to perform the method described in one or more of items 1 to 34. (Item 36) 35. A non-transitory computer-readable program storage medium storing code that, when executed by a processor, causes the processor to perform a method described in one or more of items 1 to 34. [Brief explanation of the drawings]

[0022] [Figure 1]1 illustrates an example of a flowchart for defining or determining a random access response window.

[0023] [Figure 2] 1 illustrates an example of a flowchart for transmitting channels during a random access procedure.

[0024] [Figure 3] 1 illustrates an example block diagram of a hardware platform that may be part of a network or communication device.

[0025] [Figure 4] 1 illustrates an example of a wireless communication system including a base station (BS) and user equipment (UE) according to some implementations of the disclosed technology. DETAILED DESCRIPTION OF THE INVENTION

[0026] For wireless communication scenarios involving multiple transmission / reception point (MTRP) transmissions and Layer 1 and Layer 2-triggered inter-cell mobility, obtaining respective timing advance (TA) values ​​for multiple transmission / reception points (TRPs) or physical cells may be required. A random access procedure triggered by a physical downlink control channel (PDCCH) order may be initiated to obtain the TA value. When a PDCCH order is received by a user equipment (UE), the following should be considered by the UE: physical random access channel (PRACH) transmissions and random access response (RAR) receptions associated with different TRPs or cells; quasi-co-location (QCL) characteristics for the PDCCH / physical downlink shared channel (PDSCH) associated with the random access procedure; steps of the random access procedure; and / or transmit power of the PRACH transmission. In this patent document, the term "PDCCH order" refers to a signal received by the UE when the UE receives a specific DCI format, whereby the UE is triggered to perform a random access procedure (e.g., a contention-free random access procedure) when the UE receives the specific DCI format indicating a PDCCH order.

[0027] The following is an overview of the technology described in the embodiments of this patent document. (1) In response to a PRACH transmission, the UE may monitor a PDCCH scrambled by the RA-RNTI / MSGB-RNTI within the random access response window. When a PRACH is transmitted to one TRP / cell and an RAR is received from another TRP / cell, the time lag or delay between the PRACH transmission and the RAR reception may be significant. For UE power saving and UE complexity reduction, a mechanism for configuring / indicating a random access response window with a longer length to detect the PDCCH or to further specify the starting point of the random access response window is considered as follows: The UE may receive a configuration including a random access response window length and / or a random access response window offset value for transmission parameters. ■ The UE may determine a new starting point for the random access response window and detect / monitor the PDCCH within the random access response window. (2) In response to the PRACH transmission, the UE can detect the PDCCH scrambled by the RA-RNTI / MSGB-RNTI and further decode the PDSCH corresponding to the PDCCH based on the DM-RS antenna port QCL characteristics. Because the information / identification of the transmission parameters for detecting / receiving the PDCCH order may differ from the information / identification of the transmission parameters indicated by the PDCCH order, and / or because the information / identification of the transmission parameters for detecting / receiving the PDCCH scrambled by the corresponding RA-RNTI / MSGB-RNTI may differ from the information / identification of the transmission parameters for detecting / receiving the PDCCH order, the QCL characteristics should be taken into consideration. (3) The UE may determine the transmit power of the PRACH transmission based on the DL-RS preamble receive target power and the calculated path loss. As for the legacy random access procedure, if the RAR is not received by the UE within the random access response window, a power ramping mechanism is used to adjust the PRACH transmit power. If the UE is configured / indicated not to receive the RAR, the power ramping mechanism is disabled. A new mechanism for adjusting the PRACH transmit power is considered as follows: For a PRACH transmission in response to a random access procedure initiated by a PDCCH order, the UE may decide to adjust the preamble receive target power or to adjust the transmit power of the PRACH transmission. ■ The power adjustment is based on a counting mechanism, for example COUNTER is incremented by 1 for each reception of a PDCCH order or for each start of a PRACH transmission associated with a transmission parameter. ■ The power adjustment is based on the indication field in the PDCCH order, for example, the indication field may indicate to the UE to adjust its transmit power. (4) The UE may receive a message from the base station, and the message may include: An instruction field is included in the message to instruct the UE to update / replace / change its C-RNTI. ■ If the indication field is not present or is indicated as a specific value, the UE's C-RNTI is not changed; otherwise, the UE updates its C-RNTI. The indication field may explicitly indicate the C-RNTI. The indication field may indicate information / identification of a transmission parameter, and the C-RNTI is configured to be associated with the transmission parameter. (5) The UE may remember / store / maintain / restore TA values ​​in response to the UE reporting a UE capability of a maximum number of remembered TA values. The UE may drop / delete / disable / clear the furthest / earliest remembered timing advance value associated with the transmission parameter. The UE may receive a transmission parameter activation MAC CE to which multiple transmission parameters are mapped / included / indicated. The UE may not initiate a random access procedure and / or may maintain timing advance values ​​associated with transmission parameters not included in the MAC CE. The UE may receive a transmission parameter deactivation MAC CE to which multiple transmission parameters are mapped / included / indicated. The UE may drop the memorized timing advance value associated with the transmission parameters included in the MAC CE.

[0028] The example headings of the various sections below are used to facilitate understanding of the disclosed subject matter and are not intended to limit the scope of the claimed subject matter in any way. Accordingly, one or more features of one example section may be combined with one or more features of another example section. Furthermore, although 5G terminology is used for clarity of description, the technology disclosed herein is not limited to 5G technology alone and may be used in wireless systems implementing other protocols.

[0029] (I. Introduction)

[0030] Downlink and uplink synchronization provide reliable wireless communication in LTE and NR wireless systems. Downlink synchronization is achieved by receiving a primary synchronization signal (PSS) and a secondary synchronization signal (SSS), and uplink synchronization is achieved by a random access procedure and uplink timing alignment maintenance. Random access procedures can be initiated for initial access, system information (SI) requests, beam failure recovery, timing alignment, etc.

[0031] Before the start of the random access procedure, the UE receives a configuration of RACH resources and a set of SS / PBCH blocks. For a typical contention-free random access procedure triggered by a PDCCH order, the UE transmits a preamble on a RACH opportunity determined based on the indication field of the PDCCH order and then detects a PDCCH scrambled by the RA-RNTI / MSGB-RNTI associated with the preamble transmission within the random access response window. If the PDCCH is not detected and / or the corresponding PDSCH is not received within the random access response window, the preamble / PRACH is retransmitted. The RAR is carried on a PDSCH scheduled by the PDCCCH scrambled by the RA-RNTI / MSGB-RNTI, and the RAR includes at least a timing advance command (TAC). The UE may determine a timing advance value for uplink transmission according to the timing advance command.

[0032] Due to different geographical locations of base stations or different beam directions of base station side panels, the timing advance required for uplink transmissions towards different cells may vary, and individual random access procedures towards different TRPs / cells are required to obtain the timing advance values.

[0033] The RACH resource configuration includes at least one of an index of the PRACH configuration, the number of preambles, the number of SSBs mapped to the PRACH opportunity, the number of preambles of the SSB, or the number of frequency division multiplexed PRACH opportunities. The PRACH configuration is predefined in a table including the format of the preamble, the frame or subframe number of the PRACH opportunity, the starting symbol of the PRACH opportunity, and the duration of the PRACH opportunity.

[0034] II. ILLUSTRATIVE EMBODIMENTS

[0035] In this patent document, the "transmission parameters" may include at least one of a transmission / reception point (TRP), a base station, a set of panels of one base station, a cell, or a physical cell. Furthermore, the transmission parameters include at least one of "information grouping one or more reference signals," a reference signal resource set, a PUCCH resource set, a search space, panel-related information, a subarray, an antenna group, an antenna port group, a group of antenna ports, a beam group, a physical cell index (PCI), TRP-related information, a CORESET, a CORESET pool, a transmission configuration indicator (TCI) state, a serving cell, an additional PCI, a candidate cell, a candidate cell group, a TAG, a "UE capability value," or a "UE capability set."

[0036] In this patent document, the information / identification of the transmission parameters may include at least one of a CORESET index, a CORESET pool index, an SS / PBCH index, a transmission configuration indicator (TCI) state index, a PCI, an RS set index, a search space identification, an SRS resource set index, a spatial relationship index, a power control parameter set index, a panel index, a beam group index, a subarray index, an index of a CDM group of DMRS ports, a group index of CSI-RS resources, a CMR set index, a TAG index, a candidate cell index, or a candidate cell list. In this patent document, an "uplink signal" may include a PUCCH, a PUSCH, an SRS, or a PRACH. In this patent document, uplink transmission may include a UL-SCH or a PUSCH, and downlink transmission may include a DL-SCH or a PDSCH.

[0037] In this patent document, a "slot" may correspond to a subslot, a frame, or a subframe. In this patent document, a PRACH opportunity may include a designated region in the time and frequency domain available for transmission of a random access preamble. In this patent document, a PRACH configuration may include at least one of the following: a preamble format, a frame or subframe number of the PRACH opportunity, a starting symbol of the PRACH opportunity, a duration of the PRACH opportunity, the number of time-domain PRACH opportunities within a PRACH slot, or the number of PRACH slots within a subframe. In this patent document, a PRACH transmission initiated by a PDCCH order may correspond to a PRACH transmission triggered by a PDCCH order or a PRACH transmission associated with a random access procedure initiated / triggered by a PDCCH order. In this patent document, the words "remember" or "remembered" may be the same as "storing" or "stored." In this patent document, the term "timing advance related message" may encompass / include at least one of a cell index, a time alignment group (TAG) index, a timing advance command, a timing advance offset, and / or a timing advance offset command.

[0038] II.(a) Exemplary Embodiment 1

[0039] Embodiment 1 describes an exemplary technique for a UE to monitor a PDCCH for a random access response within a random access response window in response to a random access procedure associated with a transmission parameter.

[0040] The UE is configured with a random access response window length (e.g., duration or length of time) for the serving cell. In some embodiments, the UE is further configured with the random access response window length associated with a transmission parameter.

[0041] In some embodiments, in response to a PRACH transmission associated with the transmission parameters, the UE detects DCI format 1_0 with a CRC scrambled by the corresponding RA-RNTI / MSGB-RNTI during the random access response window. The random access response window starts at a symbol determined based on at least one of the following: (1) the first symbol of the earliest CORESET at which the UE is configured to receive a PDCCH for a Type 1-PDCCH CSS set, which may be the one configured for the serving cell or the corresponding transmission parameters; (2) an offset value at which the UE is configured for the transmission parameters, which indicates the number of symbols or slots; (3) an indication field in the DCI format for PDCCH order, which indicates the number of milliseconds, symbols, or slots; or (4) the first or last symbol of the corresponding PRACH transmission. The length of the random access response window is determined based on at least one of the following: (1) the length of the random access response window configured for the serving cell or the corresponding transmission parameters; (2) an offset value configured by the UE for the transmission parameters, where the offset value indicates the number of milliseconds; (3) an indication field in the DCI format for the PDCCH order, where the indication field indicates the number of milliseconds. In some embodiments, the UE is configured by an RRC message with a set of values ​​or a combination of values ​​associated with the starting point and / or length of the random access response window, and the codepoints of the indication field of the DCI format for the PDCCH order are mapped to values ​​or combinations of values ​​within the configured set of values. In some embodiments, the UE reports its capability for a maximum length of the random access response window and / or a maximum time gap between the start of the random access response window and a PRACH transmission or a CORESET at which the UE is configured to receive PDCCH for a Type 1-PDCCH CSS set.

[0042] II.(b) Exemplary Embodiment 2

[0043] Embodiment 2 describes an exemplary technique for a UE to determine the DM-RS port quasi-co-location characteristics of the PDCCH / PDSCH associated with the RA-RNTI / MSGB-RNTI in response to a PRACH transmission initiated by a PDCCH order (or a PDCCH order message) including (or indicating) information / identification of transmission parameters. For example, a first TRP may transmit a message indicating the PDCCH order to the UE, and the message may include information or identification of a second TRP so that the UE may be triggered to perform a random access procedure with the second TRP.

[0044] For a PRACH transmission in a PRACH opportunity, the corresponding RA-RNTI / MSGB-RNTI is calculated by the base station and applied to the PDSCH or PDCCH. In response to the PRACH transmission, the UE detects the PDCCH scrambled with the corresponding RA-RNTI / MSGB-RNTI within the random access response window and further receives the PDSCH scheduled with the RA-RNTI / MSGB-RNTI.

[0045] In response to a PRACH transmission initiated by a PDCCH order including (or indicating) information / identification of transmission parameters, if the information / identification of transmission parameters for detecting / receiving the PDCCH order differs from the information / identification of transmission parameters indicated by the PDCCH order, and / or if the information / identification of transmission parameters for detecting / receiving a PDCCH scrambled by the corresponding RA-RNTI / MSGB-RNTI differs from the information / identification of transmission parameters for detecting / receiving the PDCCH order, the UE may perform at least one of the following: ·(1) The UE determines that the DM-RS port QCL characteristics of the PDCCH scrambled by the corresponding RA-RNTI / MSGB-RNTI are the same as the characteristics of the SSB / CSI-RS used for PRACH association and transmission. ·(2) The UE determines that the DM-RS port QCL characteristics of the PDSCH scheduled using the corresponding RA-RNTI / MSGB-RNTI are the same as the characteristics of the SSB / CSI-RS used for PRACH association and transmission. ·(3) The UE determines that the DM-RS port QCL characteristics of the PDCCH scrambled by the corresponding RA-RNTI / MSGB-RNTI are the same as the characteristics of the CORESET associated with the Type 1-PDCCH CSS set. ·(4) The UE determines that the DM-RS port QCL characteristics of the PDSCH scheduled using the corresponding RA-RNTI / MSGB-RNTI are the same as the characteristics of the PDCCH scrambled by the corresponding RA-RNTI / MSGB-RNTI.

[0046] In response to a PRACH transmission initiated by a PDCCH order including (or indicating) information / identification of transmission parameters, if the information / identification of transmission parameters for detecting / receiving the PDCCH order is different from the information / identification of transmission parameters indicated by the PDCCH order, and if the information / identification of transmission parameters for detecting / receiving a PDCCH scrambled by the corresponding RA-RNTI / MSGB-RNTI is the same as the information / identification of transmission parameters for detecting / receiving the PDCCH order, at least one of the following: ·(1) If a PDCCH order triggers a CFRA for an SpCell, the UE determines that the PDCCH order and the PDCCH scrambled by the corresponding RA-RNTI / MSGB-RNTI have the same DM-RS port QCL characteristics; ·(2) If a PDCCH order triggers a CFRA for an SCell, the UE determines that the DM-RS port QCL characteristics of the PDCCH scrambled by the corresponding RA-RNTI / MSGB-RNTI are the same as the characteristics of the CORESET associated with the Type 1-PDCCH CSS set. ·(3) The UE determines that the DM-RS port QCL characteristics of the PDSCH scheduled using the corresponding RA-RNTI / MSGB-RNTI are the same as the characteristics of the PDCCH scrambled by the corresponding RA-RNTI / MSGB-RNTI. ·(4) If a PDCCH order triggers a CFRA for the SpCell, the UE determines that the DM-RS port QCL characteristics of the PDSCH scheduled with the corresponding RA-RNTI / MSGB-RNTI are the same as the characteristics of the CORESET associated with the reception / detection of the PDCCH order. (5) The UE determines that the DM-RS port QCL characteristics of the PDCCH scrambled by the corresponding RA-RNTI / MSGB-RNTI are the same as the DM-RS port QCL characteristics of the downlink reference signal associated with the TCI state corresponding to the transmission parameters (e.g., CORESET pool) indicated by the PDCCH order. In some embodiments, the TCI state may be the TCI state with the lowest TCI state index among the TCI states corresponding to the transmission parameters. In some embodiments, the TCI state may be the TCI state associated with the CORESET with the lowest CORESET index corresponding to the transmission parameters.

[0047] In the above embodiment, the Type 1-PDCCH CSS set is configured to detect / receive a PDCCH scrambled by the RA-RNTI / MSGB-RNTI in response to a PRACH transmission associated with a transmission parameter, and the transmission parameter may be associated with information / identification of a transmission parameter for detecting / receiving a PDCCH order or information / identification of a transmission parameter indicated by the PDCCH order.

[0048] (II.(c) Exemplary Embodiment 3)

[0049] Embodiment 3 describes an exemplary technique for a UE to determine the transmit power of a PRACH transmission in response to a random access procedure triggered by a PDCCH order.

[0050] In some embodiments, the UE is configured / indicated to report or not receive a random access response in response to a PRACH transmission associated with the transmission parameters, or the UE does not detect a PDCCH scrambled with the RA-RNTI / MSGB-RNTI or does not receive an RAR in response to a PRACH transmission.

[0051] In some embodiments, when a random access preamble associated with a transmission parameter (the transmission parameter is configured / indicated not to receive an RAR) is transmitted by the MAC entity of the UE, at least one of the following may be performed by the UE: the corresponding random access procedure is considered completed and the MAC entity does not start a random access response window; or the MAC entity does not monitor the PDCCH for a random access response identified by the corresponding RA-RNTI / MSGB-RNTI. In one example, the UE is indicated not to receive an RAR by receiving a DCI format or MAC CE that may include a field including an identification or index of the transmission parameter, the field indicating that the UE should not receive an RAR associated with the transmission parameter.

[0052] In some embodiments, if a random access procedure associated with transmission parameters triggered by a PDCCH order is in progress / running / not completed and the UE receives another PDCCH order triggering a random access procedure associated with the same transmission parameters, the UE considers the random access procedure associated with the transmission parameters to be retriggered, the ongoing random access procedure is considered to be completed, and the UE initiates the random access procedure based on the second received PDCCH order. In some embodiments, the PDCCH order and the another PDCCH order indicate the same information / identification of the transmission parameters. In some embodiments, the PDCCH order and the another PDCCH order further indicate at least one of the same random access preamble index, PRACH mask index, or SSB index.

[0053] In some embodiments, a UE receives a PDCCH order to initiate a random access procedure associated with transmission parameters, and random access procedures associated with the same transmission parameters triggered by (n) previous / prior received PDCCH orders are in progress / running / not yet completed, and the UE determines to adjust a PRACH receive target power or a PRACH transmit power for a PRACH transmission in response to the initiated random access procedure.

[0054] The UE adjusting the PRACH receive target power (e.g., open-loop power control parameters configured for the PRACH transmission) or the PRACH transmit power for the PRACH transmission is based on the RRC-configured preamble receive target power, the path loss calculated based on the DL-RS associated with the random access procedure, and the transmit power adjustment value, where the transmit power adjustment value is determined based on at least one of the following: (1) The adjustment value of the transmission power is fixed / predetermined. (2) The transmission power adjustment value is set for the transmission parameters in the RRC message. (3) The transmission power adjustment value is indicated in an indication field of the PDCCH order associated with the PRACH transmission, for example, in the absolute TPC command field. (4) The transmit power adjustment value is determined based on the transmit power adjustment value for another PRACH transmission triggered by a previous PDCCH order, where the indication field of the PDCCH order corresponds to the PRACH transmission. In one example, if the indication field indicates a transmit power adjustment value of X dB and the transmit power adjustment value of the PRACH transmission triggered by the previous PDCCH order is Y dB, the transmit power adjustment value of the PRACH transmission triggered by the PDCCH order is (X+Y) dB. (5) The transmission power adjustment value is based on a fixed / predefined / configured power adjustment parameter and an indication field of the PDCCH order associated with the PRACH transmission. If the indication field is absent or indicates a value of 0, the transmit power adjustment value is equal to 0; otherwise, the transmit power adjustment value is determined based on the indication field and the power adjustment parameter. In one example, if the indication field indicates a value of X and the power adjustment parameter is configured to be Y dB, the transmit power adjustment value is X*Y dB. The indication field indicates a flag / toggle having one bit; if the value of the indication field in the latter received PDCCH order is the same as that in the former received PDCCH order, the transmit power adjustment value is the same as that of the PRACH transmission triggered by the former received PDCCH order; otherwise, the transmit power adjustment value is determined based on the transmit power adjustment value of the PRACH transmission triggered by the former received PDCCH order and the power adjustment parameter. In one example, if the power adjustment parameter is configured to be X dB, the values ​​of the indication fields of the first and second PDCCH orders are 0 and 1, respectively, and the transmit power adjustment value for the PRACH transmission triggered by the first PDCCH order is Y dB, then the transmit power adjustment value for the PRACH transmission triggered by the second PDCCH order is (X + Y) dB. (6) The transmit power adjustment value is based on a fixed / predefined / configured power adjustment parameter and a value counted by the UE for PDCCH orders / random access procedures associated with the transmission parameter. In one example, if the power adjustment parameter is configured to be X dB and the UE receives three PDCCH orders triggering random access procedures associated with the same transmission parameter, the transmit power adjustment values ​​for the respective PRACH transmissions are therefore 0 dB, X dB, and 2*X dB. The count values ​​are 0, 1, and 2, respectively.

[0055] In the above embodiments, if a PRACH transmission associated with a transmission parameter triggered by a PDCCH order is in response to a random access procedure initiated for the transmission parameter for the first time or is initiated for a transmission parameter that is distinct from a previously initiated random access procedure, no transmission power adjustment is required or the transmission power adjustment is zero.

[0056] II.(d) Exemplary Embodiment 4

[0057] Embodiment 4 describes an exemplary technique for specifying an indication field in a message from the base station side in response to a random access procedure or in connection with an event that requests a random access procedure.

[0058] In some embodiments, after completion of a PRACH transmission associated with the transmission parameters or a random access procedure associated with the transmission parameters, the UE receives a cell switch command message indicating switching to new transmission parameters, and the cell switch command message may include information / identification of the new transmission parameters.

[0059] In some embodiments, the UE receives a cell switch command message including an indication field indicating information of the C-RNTI; If the indication field explicitly indicates a C-RNTI or TC-RNTI, the UE applies the indicated C-RNTI / TC-RNTI to uplink and downlink transmissions. If the indication field indicates an offset value of the C-RNTI, the UE determines the C-RNTI to be applied to uplink transmission and downlink transmission based on the current C-RNTI and the offset value.

[0060] In some embodiments, the UE is configured with an association between the C-RNTI and the transmission parameters, the UE receiving a cell switch command message including a transmission parameter information / identification field; · If no association between the C-RNTI and the transmission parameters is configured, the UE does not update / modify / replace the C-RNTI. If an association between the C-RNTI and the transmission parameters is configured, the UE applies the C-RNTI associated with the transmission parameters to uplink transmission and downlink transmission.

[0061] In some embodiments, the UE receives a random access response in response to a PRACH transmission associated with a transmission parameter, which may be a candidate cell, a CORESETPool with coreset pool index=1, an additional PCI, or a RACH configuration not configured for the serving cell. At least one of the following is considered by the UE: ·UL Grant Field is reserved. The Temporary C-RNTI field indicates the C-RNTI associated with the transmission parameters. After the UE receives a Cell Switch Command message indicating information / identification of the transmission parameters, the C-RNTI is used for the UE. The Temporary C-RNTI field indicates a C-RNTI index. The UE is configured with a set / pool / list of C-RNTIs for transmission parameters, or a set / pool / list of combinations / mappings / associations of C-RNTIs and transmission parameters. The C-RNTI index is mapped to the C-RNTI of the transmission parameter, or to the combinations / mappings / associations of C-RNTIs and transmission parameters. There is no Temporary C-RNTI field, and a separate indication field indicates the C-RNTI or C-RNTI index, which is mapped to the C-RNTI of the transmission parameter or to the combination / mapping / association of the C-RNTI with the transmission parameter.

[0062] II.(e) Exemplary Embodiment 5

[0063] Embodiment 5 describes an exemplary technique for a UE to remember (or store), maintain, or restore a TA value in response to the UE reporting the UE capability of the maximum number of TA values ​​to be stored.

[0064] In some embodiments, the UE initiates a random access procedure associated with the transmission parameters and receives a random access response that includes at least a timing advance related message. The UE may remember (or store) one TA value per transmission parameter (e.g., per TRP, per cell, or per TAG). If the timing advance related message is associated with transmission parameters for which the UE has determined that it already has memorized (or remembers) a timing advance (TA) value or for which the UE has determined that it has already initiated / completed a random access procedure, the UE determines a new TA value based on the received timing advance related message and updates the TA value associated with the transmission parameters. If the timing advance related message is associated with a transmission parameter for which the UE has determined that it has not memorized (or has not remembered) a TA value or for which it has determined that the random access procedure has not been initiated, and the UE has determined that memorizing or storing the TA value would not exceed the UE's capability (or the total number of TA values ​​stored by the UE), the UE determines a TA value based on the received timing advance related message and memorizes (or stores) the TA value associated with the transmission parameter. If a TA-related message is associated with a transmission parameter for which the UE has determined that it has not memorized (or has not remembered) a TA value or for which it has determined that the random access procedure has not been initiated, and if the UE determines that the total number of memorized (or stored) TA values ​​is equal to the UE's capabilities (or the total number of TA values ​​stored by the UE), the UE shall drop / delete / invalidate / clear the furthest / earliest memorized TA value associated with another transmission parameter, and the UE shall determine a TA value based on the received timing advance-related message and memorize (or store) the TA value associated with the transmission parameter.

[0065] In some embodiments, the UE receives a transmission parameter activation MAC CE to which multiple transmission parameters are mapped / included / indicated, where the total number of transmission parameters or the number of unique transmission parameters in the MAC CE is less than or equal to the UE capability of the maximum number of remembered TA values, and the UE does not initiate a random access procedure and / or maintain timing advance values ​​associated with transmission parameters not included in the MAC CE.

[0066] In some embodiments, all of the transmission parameters included in the different transmission parameter activation MAC CEs are considered activated transmission parameters. In some embodiments, only the transmission parameters included in the most recently received activation MAC CE are considered activated. The UE initiates a random access procedure and / or maintains a timing advance value associated with the activated transmission parameters.

[0067] In some embodiments, the UE receives a transmission parameter deactivation MAC CE to which multiple transmission parameters are mapped / included / indicated, and the UE drops a memorized timing advance value associated with the transmission parameters included in the MAC CE.

[0068] 1 illustrates an example of a flowchart for defining or determining a random access response window. Operation 102 includes receiving, by a communication device, a control information format indicating that a random access procedure associated with transmission parameters should be initiated. Operation 104 includes performing, by the communication device, a random access channel (RACH) transmission in response to receiving the control information format. Operation 106 includes receiving, in response to the RACH transmission, a control channel with a cyclic redundancy check (CRC) scrambled by a radio network temporary identifier (RNTI), the RNTI being associated with the RACH transmission. Operation 108 includes receiving, by the communication device, a shared channel scheduled by the RNTI, the control channel and the shared channel being received during the random access response window defined according to a rule.

[0069] In some embodiments, the rules specify that the random access response window starts at a symbol based on one or more of the following: (1) the first symbol of the earliest control resource set (CORESET) that the communication device is configured to receive control channels for a Type 1-PDCCH common search space (CSS) set configured for a serving cell or transmission parameters; (2) an offset value for the transmission parameters, the offset value indicating the number of symbols or the number of slots; (3) an indication field of a control information format for a physical downlink control channel (PDCCH) order that triggers the random access procedure, the indication field indicating the number of milliseconds, the number of symbols, or the number of slots; or (4) the first or last symbol of a RACH transmission. In some embodiments, the rules specify that the length of the random access response window is based on one or more of the following: (1) another length of the random access response window configured for the serving cell or corresponding transmission parameters; (2) an offset value for the transmission parameters. The offset value indicates the number of milliseconds; (3) an indication field of a control information format for a physical downlink control channel (PDCCH) order that triggers a random access procedure. The indication field indicates the number of milliseconds.

[0070] In some embodiments, the rules specify that the random access response window is based on: a configured set of values ​​or a combination of values ​​associated with a starting point of the random access response window and / or a length of the random access response window. The configured set of values ​​is configured by a radio resource control (RRC) message; or a code point of an indication field of a control information format for a physical downlink control channel (PDCCH) order that triggers the random access procedure. The code point is mapped to a value or a combination of values ​​within the configured set of values. In some embodiments, the control information format includes a downlink control information (DCI) format, the control channel is a physical downlink control channel (PDCCH), and the shared channel is a physical downlink shared channel (PDSCH).

[0071] In some embodiments, the method further includes receiving, by the communications device, a physical downlink control channel (PDCCH) order associated with a first transmission parameter using a first quasi-co-location (QCL) characteristic of a reference signal port; and receiving, by the communications device, the channel using a second QCL characteristic of the reference signal port in response to at least one of: (1) first information or first identification of the first transmission parameter for receiving the PDCCH order being different from second information or second identification of the second transmission parameter indicated by an indication field in the PDCCH order; or (2) first information or first identification of the first transmission parameter for receiving the PDCCH order being different from third information or third identification of the transmission parameter for receiving the channel. In some embodiments, the second QCL characteristics of the reference signal port for receiving the channel are the same as the characteristics of the synchronization signal block (SSB) or channel state information reference signal (CSI-RS) used to perform the RACH transmission, and the channel is a physical downlink control channel (PDCCH) scrambled with the RNTI, or the channel is a physical downlink shared channel (PDSCH) scheduled with the RNTI.

[0072] In some embodiments, the second QCL characteristics of the reference signal port for receiving the channel are the same as the characteristics of a control resource set (CORESET) associated with a Type 1 physical downlink control channel (PDCCH) common search space (CSS) set, and the channel is a physical downlink control channel (PDCCH) scrambled with the RNTI. In some embodiments, the second QCL characteristics of the reference signal port for receiving the channel are the same as the characteristics of the physical downlink control channel (PDCCH) scrambled with the RNTI, and the channel is a physical downlink shared channel (PDSCH) scheduled with the RNTI. In some embodiments, the reference signal port includes a demodulation reference signal (DM-RS) port. In some embodiments, the method further includes receiving, by the communications device, a physical downlink control channel (PDCCH) order associated with a first transmission parameter using a first quasi-co-location (QCL) characteristic of a reference signal port; and receiving, by the communications device, the channel using a second QCL characteristic of the reference signal port in response to (1) first information or first identification of the first transmission parameter for receiving the PDCCH order being different from second information or second identification of a second transmission parameter indicated by an indication field in the PDCCH order, or (2) the first information or first identification of the first transmission parameter for receiving the PDCCH order being the same as third information or third identification of the transmission parameter for receiving the channel.

[0073] In some embodiments, the second QCL characteristics of the reference signal port for receiving the channel are the same as the characteristics of a control resource set (CORESET) associated with a Type 1 physical downlink control channel (PDCCH) common search space (CSS) set, and the channel is a physical downlink control channel (PDCCH) scrambled with the RNTI. In some embodiments, the second QCL characteristics of the reference signal port for receiving the channel are the same as the characteristics of a physical downlink control channel (PDCCH) scrambled with the RNTI, and the channel is a physical downlink shared channel (PDSCH) scheduled with the RNTI. In some embodiments, the second QCL characteristics of the reference signal port for receiving the channel are the same as the characteristics of a control resource set (CORESET) associated with receiving a PDCCH order, and the channel is a physical downlink shared channel (PDSCH) scrambled with the RNTI.

[0074] In some embodiments, the reference signal port includes a demodulation reference signal (DM-RS) port. In some embodiments, the method further includes receiving, by the communications device, a configuration or an indication of whether to receive a random access response (RAR); and performing, in response to receiving the configuration or indication, any one or more of the following operations: determining that a random access procedure in response to transmission of the random access preamble is completed, a random access response window is not started by a medium access control (MAC) entity of the communications device, or a physical downlink control channel (PDCCH) is not monitored by a MAC entity in the RAR identified by the corresponding RNTI.

[0075] In some embodiments, the method further includes adjusting a random access channel (RACH) target receive power or a power at which a RACH transmission is performed during the random access procedure in response to receiving a control information format indicating that a random access procedure should be initiated, the adjustment being performed based on at least one of (1) a fixed power adjustment parameter, a predefined power adjustment parameter, or a configured power adjustment parameter, or (2) an indication field included in the control information format, the indication field indicating a count indication, a toggle flag, or a power control command. In some embodiments, the method further includes receiving, by the communication device, a cell switch command message or a random access response (RAR) including an indication field indicating a second RNTI, and performing transmission or reception by applying the second RNTI indicated in the indication field, applying the second RNTI based on an offset value indicated in the indication field and associated with the second RNTI, and applying the second RNTI associated with the transmission parameter indicated in the indication field.

[0076] In some embodiments, a configuration regarding an association between a second RNTI and a transmission parameter is received by the communications device. In some embodiments, the second RNTI is a Cell Radio Network Temporary Identifier (C-RNTI) or a Temporary Cell Radio Network Temporary Identifier (TC-RNTI). In some embodiments, the method further includes receiving, by the communications device, a timing advance-related message associated with the transmission parameter based on receiving a Random Access Response (RAR), and determining, by the communications device, a Timing Advance (TA) value associated with the transmission parameter. In some embodiments, the method further includes receiving, by the communications device, a Medium Access Control Element (MAC CE) indicating a plurality of transmission parameters, wherein a first total number of the plurality of transmission parameters or a second total number of one or more unique transmission parameters in the plurality of transmission parameters is less than or equal to a total number of TA values ​​that the communications device can store, and storing, by the communications device, the TA value associated with the transmission parameter indicated by the MAC CE.

[0077] In some embodiments, the method further includes receiving, by the communications device, a deactivation medium access control element (MAC CE) indicating one or more transmission parameters to be deactivated; and deleting one or more TA values ​​associated with the one or more transmission parameters in response to receiving the deactivation MAC CE. In some embodiments, the method further includes performing a TA-related operation in response to the number of TA values ​​stored in the communications device being equal to a total number of TA values ​​storable by the communications device and no timing advance (TA) value for the transmission parameter being stored by the communications device, the TA-related operation including deleting a second TA value stored in the communications device at an earliest time relative to one or more other TA values ​​stored in the communications device; and storing the TA value after the deletion.

[0078] In some embodiments, the transmission parameters include any one or more of information grouping one or more reference signals, a reference signal resource set, a physical uplink control channel (PUCCH) resource set, a search space, panel-related information, a subarray, an antenna group, an antenna port group, a group of antenna ports, a beam group, a physical cell index (PCI), transmit / receive point (TRP)-related information, a control resource set (CORESET), a CORESET pool, a transmission configuration indicator (TCI) state, a serving cell, an additional PCI, a candidate cell, a candidate cell group, a timing advance group (TAG), a UE capability value, or a UE capability set.

[0079] 2 shows an example of a flowchart for transmitting a channel during a random access procedure. Operation 202 includes transmitting, by the network device, a control information format indicating to a communication device to initiate a random access procedure associated with transmission parameters. Operation 204 includes receiving, by the network device, a random access channel (RACH) transmission in response to transmitting the control information format. Operation 206 includes transmitting, in response to receiving the RACH transmission, a control channel with a cyclic redundancy check (CRC) scrambled by a radio network temporary identifier (RNTI), the RNTI being associated with the RACH transmission. Operation 208 includes transmitting, by the network device, a shared channel scheduled by the RNTI.

[0080] In some embodiments, the control information format includes an indication field for indicating to the communication device to adjust a random access channel (RACH) target receive power or a power at which RACH transmission is performed during the random access procedure, the indication field indicating a count indication, a toggle flag, or a power control command. In some embodiments, the method further includes transmitting, by the network device, a cell switch command message or a random access response (RAR) including an indication field indicating the second RNTI. In some embodiments, a configuration regarding an association between the second RNTI and transmission parameters is transmitted by the network device. In some embodiments, the second RNTI is a Cell Radio Network Temporary Identifier (C-RNTI) or a Temporary Cell Radio Network Temporary Identifier (TC-RNTI).

[0081] In some embodiments, the method further includes transmitting, by the network device, a timing advance-related message associated with the transmission parameters based on the transmission of the random access response (RAR). In some embodiments, the method further includes transmitting, by the network device, a medium access control control element (MAC CE) indicating the plurality of transmission parameters, wherein a first total number of the plurality of transmission parameters or a second total number of the one or more unique transmission parameters in the plurality of transmission parameters is less than or equal to a total number of TA values ​​that the communication device can store. In some embodiments, the method further includes transmitting, by the network device, a deactivation medium access control control element (MAC CE) indicating one or more transmission parameters to be deactivated. In some embodiments, the transmission parameters include any one or more of information grouping one or more reference signals, a reference signal resource set, a physical uplink control channel (PUCCH) resource set, a search space, panel-related information, a subarray, an antenna group, an antenna port group, a group of antenna ports, a beam group, a physical cell index (PCI), transmit / receive point (TRP)-related information, a control resource set (CORESET), a CORESET pool, a transmission configuration indicator (TCI) state, a serving cell, an additional PCI, a candidate cell, a candidate cell group, a timing advance group (TAG), a UE capability value, or a UE capability set.

[0082] FIG. 3 shows an example block diagram of a hardware platform 300 that may be part of a network device (e.g., a base station) or a communication device (e.g., user equipment (UE)). The hardware platform 300 includes at least one processor 310 and a memory 305 storing instructions. The instructions, when executed by the processor 310, configure the hardware platform 300 to perform the operations described in FIGS. 1-2 and in various embodiments described in this patent document. The transmitter 315 transmits or sends information or data to other devices. For example, a network device transmitter may send a message to a user equipment. The receiver 320 receives information or data transmitted or sent by another device. For example, a user equipment may receive a message from a network device.

[0083] The implementation aspects described above apply to wireless communications. Figure 4 illustrates an example of a wireless communication system (e.g., a 5G or NR cellular network) including a base station 420 and one or more user equipment (UE) 411, 412, and 413. In some embodiments, the UE accesses a BS (e.g., a network) using a communication link to the network (indicated by dashed arrows 431, 432, and 433, sometimes referred to as the uplink direction), and the communication link enables subsequent communication from the BS to the UE (indicated by arrows 441, 442, and 443, sometimes referred to as the downlink direction). In some embodiments, the BS transmits information to the UE (indicated by arrows 441, 442, and 443, sometimes referred to as the downlink direction), which enables subsequent communication from the UE to the BS (indicated by dashed arrows 431, 432, and 433, sometimes referred to as the uplink direction). The UE may be, for example, a smartphone, a tablet, a mobile computer, a machine-to-machine (M2M) device, an Internet of Things (IoT) device, etc.

[0084] The term "exemplary" is used herein to mean "an example" and does not refer to an ideal or preferred embodiment, unless expressly stated otherwise.

[0085] Some of the embodiments described herein are described in the general context of a method or process that may be implemented in one embodiment by a computer program product embodied in a computer-readable medium containing computer-executable instructions, such as program code, executed by computers in a network environment. Computer-readable media may include removable and non-removable storage devices, including, but not limited to, read-only memory (ROM), random access memory (RAM), compact discs (CDs), digital versatile discs (DVDs), and the like. Thus, computer-readable media may include non-transitory storage media. Generally, program modules may include routines, programs, objects, components, data structures, etc. that perform particular tasks or implement particular abstract data types. Computer- or processor-executable instructions, associated data structures, and program modules represent examples of program code for executing steps of the methods disclosed herein. The particular sequence of such executable instructions or associated data structures represents examples of corresponding acts for implementing the functions described in such steps or processes.

[0086] Some of the disclosed embodiments may be implemented as devices or modules using hardware circuits, software, or a combination thereof. For example, a hardware circuit implementation may include discrete analog and / or digital components integrated, for example, as part of a printed circuit board. Alternatively or additionally, the disclosed components or modules may be implemented as application-specific integrated circuits (ASICs) and / or field-programmable gate array (FPGA) devices. Some implementations may also or alternatively include digital signal processors (DSPs), which are dedicated microprocessors with architectures optimized for the operational needs of digital signal processing associated with the disclosed functionality of the present application. Similarly, various components or subcomponents within each module may be implemented in software, hardware, or firmware. Connections between modules and / or components within a module may be provided using any one of the connection methods and mediums known in the art, including, but not limited to, communication via the Internet, wired, or wireless networks using appropriate protocols.

[0087] While this document contains many details, these should not be construed as limitations on the scope of the claimed invention or the invention that may be claimed, but rather as descriptions of features specific to particular embodiments. Certain features described herein in the context of separate embodiments may also be implemented in combination in a single embodiment. Conversely, various features described in the context of a single embodiment may also be implemented in multiple embodiments separately or in any suitable subcombination. Furthermore, while features may be described above as acting in a particular combination and initially claimed as such, one or more features from a claimed combination may, in some cases, be cut from the combination, and the claimed combination may be directed to a subcombination or a variation of the subcombination. Similarly, while operations are shown in the figures in a particular order, this should not be understood as requiring such operations to be performed in the particular order shown, or in the sequential order, or that all of the operations shown be performed, to achieve desirable results.

[0088] Only some implementations and examples have been described, and other implementations, enhancements, and variations can be made based on what is described and illustrated in this disclosure.

Claims

1. 1. A wireless communication method, the method comprising: receiving, by a communication device, a control information format, the control information format associated with a first physical cell index (PCI), the control information format indicating a physical downlink control channel (PDCCH) order for initiating a random access procedure associated with a second PCI of a serving cell of the communication device; performing a random access channel (RACH) transmission by the communication device in response to receiving the control information format; receiving, in response to the RACH transmission, a control channel with a cyclic redundancy check (CRC) scrambled by a radio network temporary identifier (RNTI), the RNTI being associated with the RACH transmission, the control channel with the CRC scrambled by the RNTI being received using a first quasi-co-location (QCL) characteristic of a reference signal port, the first QCL characteristic of the reference signal port being the same as a characteristic of a control resource set (CORESET) associated with a Type 1 physical downlink control channel (PDCCH) common search space (CSS) set; the communication device receiving a shared channel scheduled by the RNTI; Including, the control channel and the shared channel are received during a random access response window; the random access response window starts with the first symbol of the earliest CORESET for which the communications device is configured to receive the control channel associated with the Type 1 PDCCH CSS set; The method, wherein the Type 1 PDCCH CSS set is configured for the serving cell.

2. The method of claim 1 , wherein the communication device receives the control information format using a second QCL characteristic of the reference signal port.

3. the control information format includes a downlink control information (DCI) format; 2. The method of claim 1, wherein the control channel is a Physical Downlink Control Channel (PDCCH) and the shared channel is a Physical Downlink Shared Channel (PDSCH).

4. The method of claim 1 , wherein the shared channel scheduled by the RNTI is received using the first QCL characteristic of the reference signal port.

5. 10. The method of claim 1, wherein the reference signal port comprises a demodulation reference signal (DM-RS) port.

6. The method further includes receiving, by the communication device, a timing advance related message based on receiving a random access response (RAR); The method of claim 1 , wherein the timing advance related message indicates a Time Alignment Group (TAG) index.

7. The method of claim 1 , wherein the PDCCH order indicates an identifier of the second PCI.

8. 10. A non-transitory computer readable program storage medium having stored thereon code that, when executed by a processor, causes the processor to perform a method according to any one of claims 1 to 7.

9. 1. A communication device for wireless communication, the communication device comprising: a processor; receiving a control information format, the control information format associated with a first physical cell index (PCI), the control information format indicating a physical downlink control channel (PDCCH) order for initiating a random access procedure associated with a second PCI of a serving cell of the communication device; performing a random access channel (RACH) transmission in response to receiving the control information format; receiving, in response to the RACH transmission, a control channel with a cyclic redundancy check (CRC) scrambled by a radio network temporary identifier (RNTI), the RNTI being associated with the RACH transmission, the control channel with the CRC scrambled by the RNTI being received using a first quasi-co-location (QCL) characteristic of a reference signal port, the first QCL characteristic of the reference signal port being the same as a characteristic of a control resource set (CORESET) associated with a Type 1 physical downlink control channel (PDCCH) common search space (CSS) set; receiving a shared channel scheduled by said RNTI; configured to perform a method for causing the communication device to the control channel and the shared channel are received during a random access response window; the random access response window starts with the first symbol of the earliest CORESET for which the communications device is configured to receive the control channel associated with the Type 1 PDCCH CSS set; The communications device, wherein the Type 1 PDCCH CSS set is configured for a serving cell.

10. The communications device of claim 9 , wherein the communications device is configured to receive the control information format using a second QCL characteristic of the reference signal port.

11. 10. The communications device of claim 9, wherein the control information format comprises a downlink control information (DCI) format, the control channel is a physical downlink control channel (PDCCH), and the shared channel is a physical downlink shared channel (PDSCH).

12. The communications device of claim 9 , wherein the shared channel scheduled by the RNTI is received using the first QCL characteristic of the reference signal port.

13. The communications device of claim 9 , wherein the reference signal port comprises a demodulation reference signal (DM-RS) port.

14. The processor further configures the communications device to receive a timing advance related message based on receipt of a random access response (RAR); The communications device of claim 9 , wherein the timing advance related message indicates a Time Alignment Group (TAG) index.

15. The communications device of claim 9 , wherein the PDCCH order indicates an identifier of the second PCI.

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