Cell access method via anchor carrier and user equipment
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- MEDIATEK SINGAPORE PTE LTD
- Filing Date
- 2017-08-11
- Publication Date
- 2026-07-21
AI Technical Summary
Existing wireless communication systems struggle to achieve forward compatibility and efficiency when supporting diverse service needs, particularly due to access difficulties caused by differences in parameter sets between different service types.
User equipment accesses the wireless network on an anchor carrier with a default subcarrier spacing, receives control information and configures the anchor carrier to achieve cell access, and uses the information carried by the anchor carrier to update system information and obtain non-basic system information, supporting efficient access for multiple service types.
It achieves forward compatibility and efficiency across different service types, supports efficient access to services such as ultra-reliable low-latency communication and large-scale MTC, and improves system flexibility and resource utilization.
Smart Images
Figure CN116669124B_ABST
Abstract
Description
[0001] This invention patent application is a divisional application of the invention patent application entitled "Cell Access Method and User Equipment via Anchored Carrier", with an international application date of August 11, 2017, international application number "PCT / CN2017 / 097194" and national application number "201780046472.2".
[0002] Cross-references to related applications
[0003] This invention claims priority under 35 U.S.SC §111(a) and under 35 U.S.SC §120 and §365(c) the subject matter of PCT application filed on August 12, 2016, entitled “METHODS AND APPARATUS FOR CELL ACCESS VIA ANCHORCARRIER”, application number PCT / CN2016 / 094938, the contents of which are incorporated herein by reference. Technical Field
[0004] The disclosed embodiments generally relate to wireless communication, and more specifically to methods and apparatus for cell access based on anchored carriers. Background Technology
[0005] The Third Generation Partnership Project (3GPP) and Long Term Evolution (LTE) mobile telecommunications systems offer high data rates, lower latency, and improved system performance. With the increasing demand for higher system capacity, radio access technology (RAT) is an area requiring improvement. Next-generation wireless systems are developing a new RAT ("NR").
[0006] One of the considerations in NR design is ensuring forward compatibility. The system design principles aimed at ensuring forward compatibility and compatibility with different features are: maximizing the use of time and frequency resources that can be flexibly used or left idle without causing backward compatibility issues in the future; minimizing the transmission of always-on signals; and limiting the signals and channels (signals, channels, signaling) used for physical layer functions within configurable / allocable time and / or frequency resources.
[0007] Furthermore, service requirements can be diverse for different services in a 5G system. In particular, different sets of parameters may be needed to support different services for efficient transmission. For example, ultra-reliable low-latency communications (UR-LLC), characterized by low latency, may be more suitable for large subcarrier spacing for data transmission with shorter subframe lengths, while latency-tolerant massive MTC (mMTC) services can use smaller subcarrier spacings and longer symbol lengths to achieve coverage extension / enhancement (CE) by concentrating power on a narrower channel bandwidth.
[0008] Therefore, single-system access that can provide multiple services by using different sets of parameters with compact common channel / signal transmission will be beneficial for achieving forward compatibility and efficiency. Summary of the Invention
[0009] The present invention provides a cell access method and apparatus via an anchor carrier. In one novel aspect, a user equipment (UE) accesses a wireless network on a default bandwidth of an anchor carrier having a default subcarrier spacing. The subcarrier spacing used in the default bandwidth is the minimum subcarrier spacing of a set of parameters supported by the system, depending on the frequency band and / or deployment scheme. In one embodiment, the UE receives control information on the default bandwidth having a default subcarrier spacing, wherein the default bandwidth is less than the system bandwidth, performs cell access based on the control information from the default bandwidth, and configures the anchor carrier with a second bandwidth, wherein the second bandwidth of the anchor carrier is greater than or equal to the default bandwidth and less than or equal to the system bandwidth.
[0010] In one embodiment, the control information carried in the default bandwidth includes at least one of a time synchronization signal (SS1), a frequency synchronization signal (SS2), a reference signal (RS), and a master information block (MIB). In another embodiment, essential system information (ESI) is also received via the default bandwidth. In one embodiment, the ESI includes at least one of frequency resources associated with the set of parameters used and the type of service. In another embodiment, non-essential system information (NON-ESI information) is received in one of the following ways: during a random access channel (RACH) access procedure, via a non-essential system information carrier including message 4 (Msg4), as a UE-dedicated channel for user-specific data scheduled by a system information response message (SI response message), and as broadcast data with a default or configurable time period indicated by the SI response message for transmission. In one embodiment, wideband access (i.e., anchored carrier access) is triggered by an indicator in the MIB. The MIB includes at least one of the following: the bandwidth of the anchor carrier, the position of the tracking reference signal, the offset between the center of the default bandwidth of the anchor carrier and the center of the system bandwidth, and the offset between the center of the default bandwidth and the center of the second bandwidth of the anchor carrier.
[0011] In another aspect of novelty, the SI information is updated. In one embodiment, the SI update information is received via broadcasting an SI-paging message. In another embodiment, the SI update information is received via a system information response message in response to a system information request message sent by a UE in a connected state.
[0012] The cell access method and user equipment via anchored carrier provided by the present invention support cell access via anchored carrier function, as well as communication with one or more user equipments via common carrier access, which is beneficial to achieving forward compatibility and efficiency.
[0013] Other embodiments and advantages are described in the detailed description below. This invention is not intended to be limited. The invention is defined by the claims. Attached Figure Description
[0014] The same reference numerals in the accompanying drawings indicate the same components, illustrating embodiments of the present invention.
[0015] Figure 1 An exemplary mobile communication network 100 including a UE with cell access supported via an anchored channel is shown according to an embodiment of the present invention.
[0016] Figure 2 An exemplary block diagram of a cell access procedure with an anchored carrier according to an embodiment of the present invention is shown.
[0017] Figure 3 Examples of the default bandwidth assumed by the UE for cell access, possible system / carrier bandwidth, and subcarrier spacing are shown.
[0018] Figure 4 This illustrates the process of cell access and system information transmission according to an embodiment of the present invention.
[0019] Figure 5 This illustrates a channel resource map over a wider default bandwidth according to an embodiment of the invention.
[0020] Figure 6 This illustrates a channel resource map over a narrow default bandwidth according to an embodiment of the present invention.
[0021] Figure 7 A flowchart for cell access according to an embodiment of the present invention is shown.
[0022] Figure 8 An exemplary flowchart of cell access on an anchored carrier according to an embodiment of the present invention is shown. Detailed Implementation
[0023] The following detailed description, taken in conjunction with the accompanying drawings, is intended to describe various configurations and is not intended to represent only the configurations in which the concepts described in the present invention can be practiced.
[0024] Reference will now be made in detail to some embodiments of the invention, examples of which are illustrated in the accompanying drawings. Certain terms are used throughout the specification and claims to refer to specific components. As those skilled in the art will recognize, manufacturers may refer to components by different names. This document is not intended to distinguish between components with different names but different functions. In the following description and claims, the terms “comprising” and “including” are used in an open-ended manner and should therefore be interpreted as meaning “including, but not limited to…”. Furthermore, the term “coupled” is intended to indicate an indirect or direct electrical connection. Accordingly, if one device is coupled to another device, the connection may be a direct electrical connection or an indirect electrical connection via other devices and connections. The making and use of embodiments of the invention are discussed in detail below. However, it should be recognized that these embodiments can be embodied in a wide variety of specific situations. The specific embodiments discussed are merely illustrative and do not limit the scope of the invention. Some variations of the embodiments are also described in the invention. Similar reference numerals are used to designate the same elements throughout the various views and illustrative embodiments. Reference will now be made in detail to some embodiments of the invention, examples of which are illustrated in the accompanying drawings.
[0025] System Architecture
[0026] Figure 1 An exemplary mobile communication network 100 according to an embodiment of the present invention is shown, wherein user equipment (UE) supports cell access via an anchor channel. The mobile communication network 100 includes one or more fixed infrastructure units forming a network distributed over a geographical area. The infrastructure unit may also be referred to as an access point, access terminal, base station, Node B, Evolved Node B (eNB), or as defined by other terms used in the art. Figure 1 In this embodiment, one or more base stations 101 and 102 serve multiple remote units / UEs 103 and 104 within a service area (e.g., a cell or cell sector). In some systems, one or more base stations are communicatively coupled to a controller to form an access network communicatively coupled to one or more core networks. However, this invention is not intended to be limited to any particular wireless communication system.
[0027] Typically, serving base stations 101 and 102 transmit downlink (DL) communication signals 112 and 113 to the UE or mobile station in the time and / or frequency domains. The UE or mobile station 103 and 104 communicate with one or more base stations 101 and 102 via uplink (UL) communication signals 111 and 114. The UE or mobile station may also be referred to as a mobile phone, laptop computer, or mobile workstation, etc. Figure 1In this context, the mobile communication network 100 is an OFDM / OFDMA system comprising base station eNB 101, eNB 102, and multiple UEs 103 and UE 104. When a downlink packet needs to be transmitted from the eNB to a UE, each UE receives a downlink allocation, such as a set of radio resources in the physical downlink shared channel (PDSCH). When a UE needs to transmit a packet to the eNB in the uplink, the UE receives permission from the eNB to allocate a physical uplink shared channel (PUSCH) consisting of a set of uplink radio resources. The UE receives downlink or uplink scheduling information from the new RAT physical downlink control channel (NR-PDCCH), which is specifically designed for new RAT UEs / mobile stations and has similar functionality to existing PDCCH, EPDCCH, and MPDCCH. The downlink or uplink scheduling information and other control information carried by the PDCCH mentioned above are called downlink control information (DCI).
[0028] Figure 1 An exemplary diagram of the protocol stacks for the control plane used in UE 103 and eNB 101 is also shown. UE 103 has a protocol stack 121, which includes a physical (PHY) layer, a medium access control (MAC) layer, a radio link control (RLC) layer, a packet data convergence protocol (PDCP) layer, and a radio resource control (RRC) layer. Similarly, eNB 101 has a protocol stack 122. Protocol stack 122 is connected to protocol stack 121. eNB protocol stack 122 includes a PHY layer, a MAC layer, an RLC layer, a PDCP layer, and an RRC layer, each layer being connected to the protocol stack of its corresponding UE protocol stack 121.
[0029] Figure 1Simplified block diagrams 130 and 150 of UE 103 and eNB 101 are further illustrated. UE 103 has an antenna 135 for transmitting and receiving radio signals. An RF transceiver 133 coupled to the antenna receives RF signals from the antenna 135, converts them into baseband signals, and sends them to the processor 132. The RF transceiver 133 also converts the baseband signals received from the processor 132 into RF signals and sends them to the antenna 135. The processor 132 processes the received baseband signals and invokes different functional modules to implement the characteristics of UE 103. Memory 131 stores program instructions and data 134 to control the operation of UE 103. After the RF transceiver 133 receives control information on a default bandwidth with a default subcarrier spacing, the processor 142 is configured to perform cell access based on the control information from the default bandwidth; and configures the anchor carrier with a second bandwidth. The default bandwidth is less than the system bandwidth, and the second bandwidth of the anchor carrier is greater than or equal to the default bandwidth and less than or equal to the system bandwidth. The second bandwidth of the anchor carrier, i.e. the bandwidth of the anchor carrier after cell access, occupies a portion of the system bandwidth and is also adjustable, including a set of continuous resources in the frequency domain.
[0030] According to an embodiment of the present invention, UE 103 further includes multiple functional modules performing different tasks. Narrowband access circuitry 141 receives control information from a common carrier in the wireless system on a default bandwidth with a default subcarrier spacing, wherein the default bandwidth is less than the system bandwidth. Configuration circuitry 143 configures an anchor carrier with a bandwidth greater than or equal to the default bandwidth and less than or equal to the system bandwidth, wherein the default bandwidth carries information and signals for cell access. Cell access processor 142 receives control information via narrowband access on the default bandwidth of the anchor carrier with the default subcarrier spacing. Cell access processor 142 enables broadband access via broadband bandwidth for broadband control information, wherein the anchor has a second bandwidth, and the second bandwidth of the anchor carrier is greater than the default bandwidth and less than or equal to the system bandwidth. In one case, in addition to the anchor carrier, there are one or more virtual carriers (VCs) in the system bandwidth. In another case, the UE can derive more VCs based on information obtained from the anchor carrier. The NON-ESI circuit 144 receives non-basic system information outside the default bandwidth, the anchor carrier bandwidth, or the anchor carrier bandwidth. The system information update processor 145 receives SI update information. The above functional modules can be implemented in hardware, software, or a combination thereof.
[0031] Figure 1An exemplary block diagram for eNB 101 is also shown. eNB 101 has an antenna 155 for transmitting and receiving radio signals. An RF transceiver 153 coupled to the antenna receives RF signals from antenna 155, converts them into baseband signals, and sends them to processor 152. RF transceiver 153 also converts baseband signals received by processor 152 into RF signals and sends them to antenna 155. Processor 152 processes the received baseband signals and invokes different functional modules to implement the characteristics of eNB 101. Memory 151 stores program instructions and data 154 to control the operation of eNB 101. eNB 101 also includes functional modules that perform different tasks according to embodiments of the present invention. Access processor 156 performs functions to support cell access via anchored carrier functionality and communication with one or more UEs via common carrier access.
[0032] Community access
[0033] Figure 2 An exemplary block diagram of a cell access procedure via an anchored carrier according to an embodiment of the present invention is shown. The cell access procedure begins with a cell identification procedure 210. Information for cell access is carried on a common carrier. The cell identification procedure 210 includes a primary synchronization signal (PSS) / secondary synchronization signal (SSS) detection procedure 211 and reference signal measurements (e.g., Reference Signal Received Power / Reference Signal Received Quality, RSRP / RSR) 212 for radio resource management (RRM) measurements. In another case, PSS and SSS are referred to as SS1 and SS2. When synchronization is successfully acquired in procedure 210, the UE begins acquiring information about the cell access or reselection procedure 220. Procedure 220 includes system information, such as MIB acquisition procedure 221 and ESI acquisition procedure 222. Once the cell access information is acquired, the UE can enter an idle state 251 if there is no connection request. The UE can also initiate paging procedure 231 upon receiving a mobile terminated (MT) message. If a mobile originated (MO) message is received, the UE can initiate random access channel access procedure 232. Subsequently, after the MT or MO procedure, the UE enters procedure 233 to obtain non-basic system information.
[0034] In a novel aspect, the UE accesses a 5G cell on a default bandwidth with a default subcarrier spacing in a common carrier, or this carrier is referred to as an anchor carrier with a default bandwidth. The default subcarrier spacing in the default bandwidth used to carry the MIB / PSS / SSS is the minimum subcarrier spacing of the set of parameters supported by the system, depending on the frequency band and / or deployment scheme. Some information carried in the anchor carrier shown for cell access can be transmitted to the UE at the default bandwidth. The UE can obtain information through narrowband access via the default bandwidth. In one embodiment, the signals and information used in procedures 210 and 220 include a timing synchronization signal SS1, a frequency synchronization signal SS2, and RS for the MIB, ESI, and common control. In one embodiment, the MIB is also carried on the default bandwidth. For a UE in idle state 251, periodic signals and information including SS1, SS2, RS, and MIB can be accessed via the default bandwidth.
[0035] In one embodiment, the default subcarrier spacing may be the minimum subcarrier spacing of the parameter set supported by the wireless system. The anchor carrier bandwidth and the anchor carrier parameter set are determined by one or more parameters, including the deployment scenario and the frequency band location determined by one or more parameters including the default subcarrier and the deployment scenario. The anchor carrier configuration may also depend on other parameters.
[0036] System bandwidth and default bandwidth
[0037] Figure 3 Examples of default bandwidth, possible system / carrier bandwidth, and subcarrier spacing assumed for cell access are shown. As illustrated, in an exemplary system configuration, different frequency bands are pre-configured with different supported system bandwidths, minimum system bandwidths, supported subcarrier spacings, and default anchor carrier bandwidth and subcarrier spacing for cell access. Figure 3 In this context, the default bandwidth and parameter set of the anchor carrier are determined by one or more parameters, including the deployment scenario and frequency band location. For example, when the frequency band is below 6 GHz, and the supported system bandwidth is 5 MHz, 20 MHz, or 80 MHz, with a minimum system bandwidth of 5 MHz, the subcarrier spacing is 15 kHz, 60 kHz, and 240 kHz, respectively. Furthermore, for cell access, the subcarrier spacing for the default bandwidth is 15 kHz.
[0038] Figure 4The process of cell access and system information transmission according to an embodiment of the present invention is illustrated. In one embodiment, the system information for a new radio access technology system may include MIB, ESI, and non-basic system information (NR_NON-ESI). For those skilled in the art, MIB, ESI, and NON-ESI are for illustrative purposes only and are not intended to limit the invention. The SI mentioned above may be referred to as MIB, ESI, NON-ESI, or other terms well known to those skilled in the art. Figure 4 As shown, anchor carrier 401 has a second bandwidth, which is greater than or equal to the default bandwidth and less than or equal to the system bandwidth 402. A carrier with a default bandwidth is also referred to as a common virtual carrier (CVC). In NR systems, the CVC is used for NR system information transmission, such as NR-sync, and / or configured to have a default bandwidth 403. The default bandwidth 403 is less than the system bandwidth 402. Box 450 represents, for example, a virtual carrier Xa used for enhanced mobile broadband (eMBB) services. Box 440 represents, for example, a (virtual) carrier Xb used for UR-LLC services.
[0039] In idle state 410, the UE receives PSS / SSS / RS information as shown in blocks 411 and 413 via a default common carrier, referred to as the default carrier. In one embodiment, as shown in blocks 412 and 414, the UE receives MIB and ESI via the default carrier. ESI can be transmitted on the default bandwidth of the anchor carrier.
[0040] MIB
[0041] In one embodiment, the MIB occupies four symbols associated with SS1 / SS2 / RS, with a period of 40ms for SS1 / SS2. In one embodiment, the MIB is carried within the default bandwidth in the default carrier frequency domain. The MIB may carry one or more parameters regarding system configuration, such as the default bandwidth, anchor carrier bandwidth (CVC BW), overall aggregated system bandwidth, and / or bandwidth and / or period used for RRM measurement or RS transmission synchronization. In one embodiment, the information carried in the MIB includes at least one of the following: the anchor carrier bandwidth, the position of the tracking reference signal, the offset between the center of the default bandwidth of the anchor carrier and the center of the second bandwidth, and the offset between the center of the default bandwidth and the center of the system bandwidth. The maximum value of the second bandwidth of the anchor carrier is the system bandwidth. The second bandwidth of the anchor carrier may also carry scheduling information such as modulation and coding scheme (MCS), resource allocation, and transmission time. To reduce overhead, the MCS and resource allocation can be limited for NON-ESI. For example, in the case of a T = 160ms period, different start subframe offsets are set in the MIB by cyclic shifting every T time period. For example, if the start time / subframe offset in NR_MIB_1stTx is 150ms, then: the start time / subframe offset in NR_MIB_2ndTx is 110ms; the start time / subframe offset in NR_MIB_3rdTx is 70ms; the start time / subframe offset in NR_MIB_4thTx is 30ms; the start time / subframe offset in NR_MIB_5thTx is 150ms; the start time / subframe offset in NR_MIB_6thTx is 110ms; the start time / subframe offset in NR_MIB_7thTx is 70ms; and the start time / subframe offset in NR_MIB_8thTx is 30ms. Here, because the ESI period is longer than the MIB and includes multiple MIB transmissions, _nth Tx represents the nth MIB transmission within the complete ESI period. At each transmission, the offset value carried in the MIB will change to indicate the time interval between the ESI and the MIB. In this example, the MIB has a transmission period of 20ms, followed by 8 MIB transmissions. It is assumed that the MIB is transmitted at a radio frame where NSFN modulo TMIB equals 0, where NSFN is the system radio frame number and TMIB is the period of the MIB. After obtaining the MIB from box 412 or box 414, the UE can obtain the timing and frequency resources for transmission on the anchor carrier.
[0042] ESI
[0043] If the default carrier bandwidth is sufficient to carry ESI, ESI can be transmitted within the default carrier bandwidth. If the default carrier bandwidth is too small (or the TBS of the ESI is too large), ESI can be transmitted with a bandwidth larger than the default carrier bandwidth. For example, NON-ESI can be transmitted on the second bandwidth of the anchor carrier or outside the second bandwidth of the anchor carrier but within the system bandwidth. If the carrier bandwidth used for ESI transmission is greater than the default carrier bandwidth, some gap is required between the MIB and ESI for RF tuning and Automatic Gain Control (AGC) tuning. Additionally, a wider bandwidth with a relevant period for RS transmission can be configured in the MIB or ESI, in addition to the default bandwidth and / or period used for RS transmission. Furthermore, value labels or SI information change notifications can be carried in the MIB in the form of a bitmap. This indicates which SI may change. Besides the RACH / paging configuration and some cell selection criteria carried in existing SIB1 / SIB2 messages in LTE, ESI can include information about frequency resources and the corresponding set of parameters used. More specifically, an ESI may include a set of parameters for each parameter set, such as a service type index (e.g., eMBB / URLLC), frequency resource information (e.g., number of virtual / real component carriers), and the parameter set used corresponding to the aforementioned parameters. Additionally, the ESI may include indications for FDD / TDD use and NON-ESI scheduling information. Furthermore, since different parameter sets are used in the time domain, especially in the case of DL / UL handover, different parameter sets will be used in both directions, and the gap between adjacent subframes will be [not specified], which can be carried within the ESI. A default subframe type indication can also be transmitted within the ESI. The size of the ESI may vary depending on the functions supported within it. For different parameter sets corresponding to different services, the ESI may provide different functions or parameters for each parameter set.
[0044] NON-ESI
[0045] NON-ESI can be allocated within the default bandwidth, within the anchor carrier, or outside the anchor carrier. In one case, NON-ESI is not carried in the default carrier, or at least not in the default bandwidth 403 during idle state 410. After the UE enters connected mode, the UE can export NON-ESI based on the ESI and MIB exported from the default bandwidth 403 and / or the anchor carrier bandwidth 402. Please refer to [reference needed]. Figure 4The UE can also obtain non-basic system information from other virtual carriers not within the default bandwidth 403. In one embodiment, the non-basic system information can be carried in block 441 in an Ultra-Reliable Low-Latency Communication Virtual Carrier (UR-LLC VC) 440. In another embodiment, the non-basic system information can be carried in block 451 in an eMBB VC 450. The non-basic system information can be carried in message 4 (Msg4) during RACH access, or scheduled as UE-specific data by a system information response message, or transmitted as broadcast data with a default or configurable period indicated / triggered by a system information response message.
[0046] During the RACH access procedure, Msg4 can carry non-basic system information messages. System information responses can be implemented via control channels (e.g., NR_PDCCH) transmitted in the control area of a subframe. System information responses can have two formats, depending on whether they are used to carry scheduling information for dedicated user-specific data about non-basic system information or simply to indicate the transmission of broadcast data about non-basic system information. If the non-basic system information is sent to the UE via a dedicated channel, the system information response will carry scheduling information for the corresponding dedicated data channel used to carry the non-basic system information. If the non-basic system information is sent via a broadcast channel for the UE, the system information response can provide one bit to indicate whether the UE should monitor the broadcast channel used to acquire the non-basic system information. The period and timing offset of the non-basic system information broadcast can be configured in the ESI and / or carried in the system information response. One bit in the system information response can be used to implicitly indicate whether the system information response is used to carry scheduling information for a dedicated data channel or to inform of the existence of a broadcast channel carrying non-basic system information. For broadcasts of non-basic system information, the period may not exist even if it is predefined or configured.
[0047] In a novel aspect, in connected mode, control information 421, control information 431 along with non-basic system information 432, and control information 433 along with user equipment paging message 434 can all be carried on the default bandwidth. In another embodiment, connection state control information, non-basic system information, and user equipment paging message are received via system bandwidth or broadband access at system bandwidth and other VCs. In yet another embodiment, connection state control information, non-basic system information, and user equipment paging message are received on a second bandwidth of the anchor carrier.
[0048] SI Update
[0049] In another aspect of novelty, SI information updates are performed via broadcast. In one embodiment, SI information updates are performed using System Information Paging (SI-paging) 442. System Information Paging 442 has a period independent of User Equipment Paging. System Information Paging 442 is broadcast to idle and / or connected UEs in the system. System Information Paging 442 indicates SI modifications, including MIB updates, ESI updates, and non-basic system information updates.
[0050] In another embodiment, SI information updates are performed in a request-based manner, such as with an SI request (SI-Request), an SI response (SI-Response), and / or a non-basic system information message. A system information request, such as SI-request 443 via UR-LLC VC 440 or SI-request 453 via eMBB VC 450, is illustrated. The system information request is sent by the UE to query for any SI information updates. System information requests can be sent to connected UEs. System information responses, such as SI-response 444 on UR-LLC VC 440 or system information response 454 on eMBB VC 450, are also shown in the figure. The system information response indicates whether any SI changes exist, including changes to the MIB and / or ESI. Once the system information response indicates a change to the MIB and / or ESI, the UE reads the common MIB and / or ESI. The system information response also indicates whether there are changes to non-basic system information. Once a change to non-basic system information is detected, the UE receives the updated non-basic system information via a dedicated message or common non-basic system information. In one embodiment, non-basic system information, such as non-ESI 445 on UR-LLC VC 440 or non-ESI 455 on eMBB VC 450, is received.
[0051] Resource Mapping
[0052] Figure 5 Resource mapping of channels over a wider default bandwidth is shown according to an embodiment of the present invention. Figure 5As shown, the control area with RS is transmitted in a distributed manner. SS1 is transmitted in a localized way in the frequency domain. For example, a 5MHz bandwidth with one PRB is assumed to include twelve subcarriers in the frequency domain and occupy seven symbols in the time domain. MIB is transmitted and associated with SS1 / SS2. For the case of two or four Access Points (APs) used for MIB, ESI, it can be assumed that the common control channel is used to support SFBC or SFBC-FSTD. The number of APs can be determined by blind detection of MIB through the CRC of the number of APs masked. In this example, SS1 / SS2 is assumed to be transmitted once every 40ms, so it is presumed that MIB is transmitted once every 40ms. Four symbols for symbol-level repetition are used for MIB transmission, and IQ symbol combination is supported to improve coverage. The number of resources reaches 23 RBs, of which 4 symbols are for the same coverage as LTE (or effective coding rate (ECR)), i.e., 1104 (= 23) in the 5MHz case. 12 4) Each RE carries 46 bits (30 information bits plus 16 CRC bits). In LTE, with only 960 REs used as the PBCH, a total of 40 bits of information (24 information bits plus 16 CRC bits) can be carried. TBCC or LDPC can be used to carry the MIB on the PBCH channel. ESI can be transmitted at 80ms or 160ms intervals until the MIB configuration is reached. ESI can be transmitted in consecutive subframes with a large transport block size (TBS) to ensure compact transmission. With a default bandwidth of 5MHz for a suitable TBS for ESI, ESI can be carried within a 5MHz default bandwidth over several subframes.
[0053] The figure also illustrates the initial access procedure on the 5MHz default bandwidth at the UE side. In step 511, the UE performs AGC tuning based on RSSI measurements. In step 512, the UE performs SS1 detection using one or two symbols for buffering. In step 513, after successful SS1 detection, a 2ms buffer is applied to SS2 detection, including MIB / ESI, within the 5MHz default bandwidth. In step 514, after successful SS2 detection, MIB channel estimation (CHEST) and demodulation can be completed. In step 515, ESI demodulation and transmission occupy three subframes.
[0054] Figure 6Channel resource mapping over a narrow default bandwidth is illustrated according to an embodiment of the invention. In one example, a 1.4 MHz bandwidth is configured as the default bandwidth. In this case, the MIB is transmitted in four consecutive subframes, with four symbols in the first subframe and five symbols in the remaining three subframes, to achieve the same effective coding rate as in the LTE or 5 MHz default bandwidth case. The ESI transmits with a bandwidth larger than the default carrier bandwidth (1.4 MHz) based on the scheduling information carried in the MIB. Figure 5 As shown, ESI is mapped within the anchor carrier. In Figure 6 In this process, the ESI is not mapped within the anchor carrier, but rather mapped to another resource block (e.g., a VC) via step 615. Considering potential RF tuning and UE processing time, the ESI cannot be transmitted immediately after the MIB transmission, which... Figure 6 Not shown in the figure. The figure illustrates the initial access procedure on the UE side with a default bandwidth of 1.4MHz. In step 611, the UE performs automatic gain control (AGC) tuning based on RSSI measurements. In step 612, the UE performs SS1 detection using one or two symbols for buffering. In step 613, after a successful SS1 detection, a 2ms buffer in the default 5MHz bandwidth is applied for SS2 detection, including the MIB. In step 614, after a successful SS2 detection, MIB CHEST and demodulation can be completed. In step 615, the MIB will schedule ESI transmission across subframes over the entire system bandwidth (e.g., 20MHz), assuming the ESI has an 80ms TTI (over two Txes) and up to 600 bits. Finally, the UE tunes the RF to a wider bandwidth for AGC tuning and then performs ESI demodulation.
[0055] Figure 7A flowchart for cell access according to an embodiment of the present invention is shown. In step 701, the UE receives SS1 from the eNB in the default anchor carrier for timing synchronization. In step 702, after successfully detecting SS1, the UE receives SS2 from the eNB in the default anchor carrier for frequency synchronization. In step 703, if SS1 / SS2 is successfully detected, the UE demodulates the MIB in the buffer for at least the storage of MIB / SS2. In step 704, fundamental system configuration information (e.g., system bandwidth, anchor carrier bandwidth, ESI control information) is obtained from the MIB. In step 705, the UE receives and demodulates the ESI to obtain fundamental system configuration information (e.g., RACH information, common channel configuration, paging information). In step 706, the UE performs a RACH access procedure to establish an RRC connection, and then in step 707, the UE obtains a NON-ESI message carried in msg4 during the RACH access procedure, or obtains NON-ESI information by sending a NON-ESI request.
[0056] Figure 8 An exemplary flowchart of cell access on an anchored carrier according to an embodiment of the present invention is shown. In step 810, the UE receives control information via narrowband access on a carrier with a default bandwidth having a default subcarrier spacing, wherein the default bandwidth is less than the system bandwidth. In step 820, the UE performs cell access based on the control information from the default bandwidth. In step 830, the UE configures an anchored carrier with a second bandwidth, wherein the second bandwidth of the anchored carrier is greater than or equal to the default bandwidth and less than or equal to the system bandwidth.
[0057] Although the invention has been described in conjunction with certain specific embodiments for illustrative purposes, the invention is not limited thereto. Therefore, various modifications, adaptations, and combinations of various features of the described embodiments can be practiced without departing from the scope of the invention as set forth in the claims.
Claims
1. A cell access method via an anchored carrier, characterized in that, include: In a wireless system with new radio access technology, a user equipment is configured with an anchor carrier having system bandwidth, wherein the anchor carrier carries information and signals for cell access; Control information is received via narrowband access on the default bandwidth of an anchor carrier with a default subcarrier spacing, wherein the default bandwidth is less than the system bandwidth; as well as When one or more broadband access conditions are detected, broadband access is enabled on the anchor carrier using a broadband bandwidth for broadband control information, wherein the broadband bandwidth is greater than the default bandwidth and less than or equal to the system bandwidth.
2. The method as described in claim 1, characterized in that, The default subcarrier spacing is the minimum subcarrier spacing supported by the wireless system, determined by one or more parameters including the default subcarrier of the frequency band and the deployment scenario.
3. The method as described in claim 1, characterized in that, The information and signals carried in the anchor carrier include at least one of time synchronization signal, frequency synchronization signal, reference signal, new radio master information block, new radio basic system information, paging, and non-basic system information.
4. The method as described in claim 3, characterized in that, The time synchronization signal, the frequency synchronization signal, and the reference signal are received on the default bandwidth.
5. The method as described in claim 4, characterized in that, One or more control messages are received via the default bandwidth, which includes the new radio master information block and the new radio basic system information.
6. The method as described in claim 3, characterized in that, The new basic radio system information includes at least one of the frequency resources associated with the set of parameters and service type used.
7. The method as described in claim 3, characterized in that, The non-basic system information is received during the random access channel access process via a non-basic system information carrier including message 4, or via a dedicated channel for the user equipment as user-specific data scheduled by the system information response message, or via broadcast data with a default or configurable period indicated for transmission by the system information response message.
8. The method as described in claim 1, characterized in that, The broadband access is triggered by an indicator in the new radio master information block.
9. The method as described in claim 1, characterized in that, It also includes receiving system information updates.
10. The method as described in claim 9, characterized in that, The system information update information is received via broadcast system information paging messages.
11. The method as described in claim 9, characterized in that, In response to a system information request message sent by the user equipment in a connected state, the system information update information is received via a system information response message.
12. A user equipment for cell access via an anchored carrier, characterized in that, include: A transceiver is used to send and receive radio signals in a wireless network with new radio access technologies; A configuration circuit for configuring an anchor carrier with system bandwidth, wherein the anchor carrier carries information and signals for cell access; A narrowband access circuit is used to receive control information via narrowband access on a default bandwidth of an anchor carrier with a default subcarrier spacing, wherein the default bandwidth is less than the system bandwidth. as well as A broadband access circuit is configured to enable broadband access on the anchor carrier via a broadband bandwidth for broadband control information when one or more broadband access conditions are detected, wherein the broadband bandwidth is greater than the default bandwidth and less than or equal to the system bandwidth.
13. The user equipment as claimed in claim 12, characterized in that, The default subcarrier spacing is the minimum subcarrier spacing supported by the wireless system, determined by one or more parameters including the frequency band default subcarrier and the deployment scenario.
14. The user equipment as claimed in claim 12, characterized in that, The information and signals carried in the anchor carrier include at least one of time synchronization signal, frequency synchronization signal, reference signal, new radio master information block, new radio basic system information, paging, and non-basic system information.
15. The user equipment as claimed in claim 14, characterized in that, The time synchronization signal, the frequency synchronization signal, and the reference signal are received on the default bandwidth.
16. The user equipment as claimed in claim 15, characterized in that, One or more control messages are received via the default bandwidth, which includes the new radio master information block and the new radio basic system information.
17. The user equipment as claimed in claim 14, characterized in that, The new basic radio system information includes at least one of the frequency resources associated with the set of parameters and service type used.
18. The user equipment as claimed in claim 14, characterized in that, The non-basic system information is received during the random access channel access process via a non-basic system information carrier including message 4, or via a dedicated channel for the user equipment as user-specific data scheduled by the system information response message, or via broadcast data with a default or configurable period indicated for transmission by the system information response message.
19. The user equipment as claimed in claim 12, characterized in that, The broadband access is triggered by an indicator in the new radio master information block.
20. The user equipment as claimed in claim 12, characterized in that, It also includes a system information update circuit for receiving system information updates.
21. The user equipment as claimed in claim 20, characterized in that, The system information update information is received via broadcast system information paging messages.
22. The user equipment as claimed in claim 20, characterized in that, In response to a system information request message sent by the user equipment in a connected state, the system information update information is received via a system information response message.