WO2014032577A1 - 随机接入响应的方法及装置 - Google Patents

随机接入响应的方法及装置 Download PDF

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Publication number
WO2014032577A1
WO2014032577A1 PCT/CN2013/082409 CN2013082409W WO2014032577A1 WO 2014032577 A1 WO2014032577 A1 WO 2014032577A1 CN 2013082409 W CN2013082409 W CN 2013082409W WO 2014032577 A1 WO2014032577 A1 WO 2014032577A1
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Prior art keywords
random access
preamble sequence
contention
contention random
sequence
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PCT/CN2013/082409
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English (en)
French (fr)
Inventor
张鹏
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中兴通讯股份有限公司
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Application filed by 中兴通讯股份有限公司 filed Critical 中兴通讯股份有限公司
Priority to JP2015528858A priority Critical patent/JP5996114B2/ja
Priority to EP13833167.3A priority patent/EP2890203B1/en
Publication of WO2014032577A1 publication Critical patent/WO2014032577A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0866—Non-scheduled access, e.g. ALOHA using a dedicated channel for access
    • H04W74/0875—Non-scheduled access, e.g. ALOHA using a dedicated channel for access with assigned priorities based access
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0833—Random access procedures, e.g. with 4-step access

Definitions

  • the present invention relates to the field of communications technologies, and in particular, to a method and apparatus for random access response. Background technique
  • the random access is an access procedure performed by the user equipment (UE, User Equipment) before starting the network communication, and the purpose is to obtain the uplink synchronization and the UE identity.
  • a random access channel (RACH) is used to implement uplink synchronization for a UE that has not obtained or has lost uplink synchronization.
  • the evolved base station eNB, evolved Node B
  • the contention of the random access means that the base station does not know the initiation of the random access procedure in advance, and the UE selects the randomly accessed resource according to the information of the system information block (SIB), including sending the physical random connection.
  • SIB system information block
  • Time-frequency resources of the inbound channel (PRACH, Physical Random Access Channel) and the preamble sequence index therefore, when multiple UEs simultaneously initiate a random access procedure, there may be multiple UEs selecting the same random access resource;
  • the number of UEs is limited, and there is a competition between multiple UEs that initiate the access. As a result, some UEs need to re-initiate the access procedure and increase the access delay.
  • Non-contention random access means The base station knows the initiation of the random access procedure in advance, and assigns a specific resource to the UE that wants to initiate the random access procedure.
  • the base station sequentially searches for different preamble sequences on the PRACH. If there is a match, it indicates that the UE initiates a random access procedure, and then responds by sending a random access response (RAR, Random Access Response), and the base station will be the same. Multiple preamble sequences detected within the transmission time interval ( ⁇ , Transmission Time Interval ) are responded; When multiple preamble sequences are detected in the TTI, and the number of RARs that can be carried in the MSG2 is less than the number of detected preamble sequences, the base station needs to decide which preamble sequences to respond to, and the current protocol does not have the above situation. Give a clear solution. Summary of the invention
  • the main purpose of the embodiments of the present invention is to provide a method and an apparatus for random access response, which are used to perform different priority responses according to different access types when multiple UEs initiate random access at the same time.
  • the embodiment of the invention discloses a method for random access response, which includes:
  • the method further comprises the steps of:
  • the RAR resources are allocated for the contention random access corresponding to the contention random access preamble sequence according to the preset order.
  • the method further includes :
  • the matched preamble sequence is divided into a non-contention random access preamble sequence and a contention random access preamble sequence.
  • the preset sequence includes the ascending or descending order of the contention random access preamble sequence.
  • the embodiment of the invention further discloses a device for random access response, comprising:
  • a preamble sequence acquisition module configured to search on the PRACH to obtain a match with the preset range
  • the random access judging module is configured to compare the allocated non-contention random access preamble sequence with the matched preamble sequence, and determine whether there is non-contention random access in the matched preamble sequence;
  • the random access response module is configured to determine, when the non-contention random access preamble sequence exists in the matched preamble sequence, allocate RAR resources for the non-contention random access corresponding to the non-contention random access preamble sequence.
  • the random access response module is further configured to:
  • the RAR resource is allocated for the contention random access corresponding to the contention random access preamble sequence according to a preset order.
  • the device further includes:
  • the random access classification module is configured to divide the matched preamble sequence into the non-contention random access preamble sequence and the contention random access preamble sequence.
  • the embodiment of the present invention obtains a preamble sequence that matches the preset range by searching on the PRACH, and compares the allocated non-contention random access preamble sequence with the matched preamble sequence to determine that there is a non-presence in the matched preamble sequence.
  • a random access preamble sequence is used, a method for allocating RAR resources for non-contention random access corresponding to a non-contention random access preamble sequence is implemented, and when multiple UEs simultaneously initiate random access, the base station performs according to different access types.
  • the beneficial effects of different priority responses improve resource utilization and overall system performance, and reduce non-contention random access latency.
  • FIG. 1 is a schematic flow chart of a first embodiment of a method for random access response according to the present invention
  • FIG. 2 is a schematic diagram of a random access signal flow in a method for random access response according to an embodiment of the present invention
  • FIG. 3 is a schematic diagram of a member structure of RAR in a method for random access response according to an embodiment of the present invention
  • FIG. 4 is a random access response of the present invention
  • the method includes a MAC sub-header and a MAC PDU schematic of the MAC RAR;
  • 5 is a schematic flow chart of a second embodiment of a method for random access response according to the present invention
  • 6 is a flow chart of a random access signal based on contention in a method for random access response according to an embodiment of the present invention
  • FIG. 7 is a schematic flow chart of a third embodiment of a method for random access response according to the present invention.
  • FIG. 8 is a schematic structural diagram of a first embodiment of a device for random access response according to the present invention.
  • FIG. 9 is a schematic structural diagram of a second embodiment of a device for random access response according to the present invention.
  • FIG. 1 is a schematic flowchart of a first embodiment of a method for random access response according to the present invention. As shown in FIG. 1, the method for random access response according to an embodiment of the present invention includes the following steps:
  • Step S01 Searching on the PRACH to obtain a preamble sequence that matches the preset range.
  • FIG. 2 is a flow chart of the random access signal in the method for random access response according to the embodiment of the present invention, including: Step 201: The eNB sends system common information (SIB/MIB) to the UE; Step 202: After receiving the system public information, the UE sends a MSG1 (message, instant message) request of the random access preamble sequence to the base station;
  • SIB/MIB system common information
  • MSG1 messages, instant message
  • Step 203 After receiving the MSG1 request, the base station returns a MSG2 response of the random access preamble sequence to the UE.
  • the base station sequentially traverses all the preamble sequences, performs a search on the PRACH, and finds all matching preamble sequences; in a preferred embodiment, the preamble sequence has a value range of [0, 63]; the base station follows from small to large.
  • the preamble sequence is sequentially used to search on the PRACH, and all the matched preamble sequences are saved, for example, the matching preamble sequence detected at the current time is ⁇ 18, 20, 22, 55 ⁇ .
  • Step S02 the allocated non-contention random access preamble sequence and the matched preamble sequence Comparing, determining whether there is a non-contention random access preamble sequence in the matched preamble sequence; if yes, executing step S03;
  • the base station compares the saved non-contention random access preamble sequence that may be triggered at the current moment with the retrieved matching preamble sequence; for example, the non-contention random access preamble sequence saved by the base station is ⁇ 50, 55 ⁇
  • the search is performed in the matched preamble sequence ⁇ 18, 20, 22, 55 ⁇ in step S01; the non-contention random access preamble sequence with the preamble sequence of 55 exists, indicating that there is non-contention random access at the moment. If the non-contention random access preamble sequence saved by the base station is ⁇ 50 ⁇ , it is not found in the matched preamble sequence in step S01, indicating that no non-contention random access occurs at this moment.
  • Step S03 Allocating non-contention random access corresponding to the non-contention random access preamble sequence
  • the base station compares the saved non-contention random access preamble sequence that may be triggered at the current time with the retrieved matching preamble sequence, and if there is a non-contention random access preamble sequence in the retrieved preamble sequence, the base station preferentially belongs to the non-contention
  • the non-contention random access corresponding to the random access preamble sequence is allocated to the RAR resource; after the RAR resource allocation corresponding to the non-contention random access is ended, the contention random access corresponding to the contention random access preamble sequence is performed. Corresponding RAR resource allocation.
  • the base station first allocates RAR resources for non-contention random access with a preamble sequence of 55, and then allocates RAR for contention random access with a preamble sequence of ⁇ 18, 20, 22 ⁇ . Resources, this ensures that non-contention random access can receive a priority response when RAR resources are limited.
  • the structure of the RAR in the RAR resource is as shown in FIG. 3, which is a schematic diagram of the member structure of the RAR in the method for random access response according to the embodiment of the present invention.
  • the RAR carries The resource is used to indicate the frequency domain location and size used by the UE when transmitting the uplink bearer data, and the corresponding description field is the UL Grant field in the RAR.
  • the RAR resource includes a frequency domain resource for carrying an uplink load, a time adjustment amount TA, and a Temporary C-RNTI (Cell Radio Network Temporary Identifier). Reference FIG.
  • FIG. 4 is a schematic diagram of a MAC PDU including a MAC subheader and a MAC RAR in a method for random access response according to an embodiment of the present invention. As shown in FIG. 4, a MAC subheader carried by a MAC PDU is not included in a MAC RAR resource.
  • the preamble sequence matching the preset range is obtained by searching on the PRACH, and the allocated non-contention random access preamble sequence is compared with the matched preamble sequence to determine that there is a non-existence in the matched preamble sequence.
  • a method for allocating RAR resources for non-contention random access corresponding to a non-contention random access preamble sequence is preferentially implemented, and when multiple UEs simultaneously initiate random access, the base station performs according to different access types. The beneficial effects of different priority responses improve resource utilization and overall system performance, and reduce non-contention random access latency.
  • FIG. 5 is a schematic flowchart of a second embodiment of a method for random access response according to the present invention.
  • the difference between this embodiment and the first embodiment of the method for random access response of the present invention is that only step S04 is added; For example, only the step S04 is specifically described.
  • step S04 is specifically described.
  • the other steps involved in the method for the random access response in this embodiment refer to the detailed description of the related embodiments, and details are not described herein again.
  • the method for random access response in this embodiment compares the saved current preamble sequence with the matched preamble sequence in step S02, and determines whether there is non-competitive randomness in the matched preamble sequence. After accessing the preamble sequence, the method further includes:
  • Step S04 If no, allocate RAR resources for the contention random access corresponding to the contention random access preamble sequence according to a preset sequence.
  • the base station preferentially allocates RAR resources for the non-contention random access corresponding to the non-contention random access preamble sequence; After the RAR resource allocation ends, the RAR resources are allocated to the contention random access corresponding to the contention random access preamble sequence according to the sequence of the random access preamble.
  • the non-contention random access preamble sequence that may be triggered by the current time saved by the base station is ⁇ 50 ⁇
  • the matching preamble sequence detected at the current time is ⁇ 18, 20, 22, 55 ⁇ , which does not include non-realization.
  • the base station sequentially competes according to the sequence of the contention random access preamble sequence.
  • the random access access sequence corresponds to the contention random access allocation RAR resource.
  • a method for randomly accessing a response according to an embodiment of the present invention is based on a contention of a random access signal flow. As shown in FIG. 6 , when competing for random access, the UE is among multiple available random access resources. Make a random selection.
  • the base station when the base station detects both the contention random access preamble sequence and the non-contention random access preamble sequence at the same time, the base station preferentially responds to the non-contention random access preamble sequence when performing the RAR response;
  • the reason for the non-contention random access and the contention random access is corresponding to different random access scenarios, and the non-contention random access application is in the handover and uplink out-of-synchronization downlink data to the triggered random access scenario.
  • the contention random access can also be applied to the initial random access, the random access triggered by the reconstruction, and the uplink out-of-synchronization uplink data to the triggered random access.
  • the non-contention randomization requires higher access delay. Secondly, since the non-contention random access is a random access procedure dominated by the base station, the response of the base station to such access should have a higher priority. Third, when the base station performs random access detection, there is a possibility of false detection. Therefore, among the multiple preamble sequences detected in the same frame, the probability of false detection corresponding to the non-contention random access preamble sequence is smaller than other competitions. Random access to the preamble sequence. Therefore, the non-contention random access preamble sequence is preferentially responded.
  • the method for allocating RAR resources for the contention random access according to the preset sequence has the beneficial effect of improving system resource utilization.
  • FIG. 7 is a schematic flowchart of a third embodiment of a method for random access response according to the present invention.
  • the difference between this embodiment and the second embodiment of the random access response method of the present invention is that only step S05 is added;
  • step S05 is added;
  • the specific steps of the method for the random access response in this embodiment are described in detail with reference to the detailed description of the related embodiments, and details are not described herein again.
  • the method for random access response in this embodiment compares the saved current preamble sequence with the matched preamble sequence in step S02, and determines whether there is non-contention random in the matched preamble sequence.
  • the method further includes: Step S05: The matched preamble sequence is divided into a non-contention random access preamble sequence and a contention random access preamble sequence.
  • the base station divides the available preamble sequences into a contention random access preamble sequence and a non-contention random access preamble sequence; for the contention random access and the non-contention random access base station, it can be known in advance because the non-contention random is triggered.
  • the access preamble sequence index is sent by the base station; therefore, when the base station simultaneously detects the contention random access preamble sequence and the non-contention random access preamble sequence at the same time, the RAR response is preferentially responded to the non-contention random connection. Enter the preamble sequence.
  • the matched preamble sequence is divided into a non-contention random access preamble sequence and a contention random access preamble sequence, and the subsequent base station simultaneously detects the contention random access preamble sequence and the non-contention random sequence at the same time.
  • the important premise of preferentially responding to the non-contention random access preamble sequence when accessing the preamble sequence has the beneficial effect of improving resource utilization.
  • FIG. 8 is a schematic structural diagram of a first embodiment of a random access response apparatus according to the present invention.
  • the apparatus for random access response according to an embodiment of the present invention includes:
  • the preamble sequence obtaining module 01 is configured to search on the PRACH to obtain a preamble sequence that matches the preset range;
  • a random access signal flow diagram in a method for random access response includes: Step 201: A base station, ie, an eNB, sends system public information (SIB/MIB) to a UE;
  • SIB/MIB system public information
  • Step 202 After receiving the system public information, the UE sends a MSG1 (message, instant message) request of the random access preamble sequence to the base station;
  • MSG1 messages, instant message
  • Step 203 After receiving the MSG1 request, the base station returns a MSG2 response of the random access preamble sequence to the UE.
  • the preamble sequence obtaining module 01 of the base station sequentially traverses all the preamble sequences, and performs a search on the PRACH to find all the matched preamble sequences.
  • the preamble sequence has a value range of [0, 63];
  • the preamble sequence obtaining module 01 uses the preamble sequence to search on the PRACH in order from small to large or from large to small, and saves all matching preamble sequences, such as
  • the matching preamble sequence detected at the current time is ⁇ 18 , 20, 22, 55 ⁇ .
  • the random access judging module 02 is configured to compare the allocated non-contention random access preamble sequence with the matched preamble sequence, and determine whether there is a non-contention random access preamble sequence in the matched preamble sequence. ;
  • the random access judging module 02 of the base station compares the saved non-contention random access preamble sequence that may be triggered at the current time with the retrieved matching preamble sequence; for example, the non-contention random access preamble saved by the base station
  • the sequence is ⁇ 50, 55 ⁇ , and the random access judging module 02 searches in the preamble sequence ⁇ 18, 20, 22, 55 ⁇ that the preamble sequence acquisition module 01 has matched; the non-contention random access preamble with a preamble sequence of 55 The sequence exists, indicating that there is non-contention random access at the moment.
  • the random access judging module 02 does not find the preamble sequence in the preamble sequence that has been matched in the preamble sequence, indicating that the preamble sequence does not occur at the moment. Non-contention random access.
  • the random access response module 03 is configured to: when the non-contention random access preamble sequence exists in the matched preamble sequence, allocate RAR resources for the non-contention random access corresponding to the non-contention random access preamble sequence ;
  • the random access response module 03 is further configured to: when it is determined that the non-contention random access preamble sequence does not exist in the matched preamble sequence, the contention random access corresponding to the contention random access preamble sequence according to the preset sequence Into the allocation of RAR resources.
  • the random access judging module 02 compares the saved non-contention random access preamble sequence that may be triggered at the current time with the retrieved matching preamble sequence, and if there is a non-contention random access preamble sequence in the retrieved preamble sequence, The random access response module 03 preferentially allocates RAR resources for the non-contention random access corresponding to the non-contention random access preamble sequence; after the RAR resource allocation corresponding to the non-contention random access ends, the random access response module 03 The RAR resources are allocated to the contention random access corresponding to the contention random access preamble sequence according to the preset sequence.
  • the random access response module 03 is preceded by a preamble sequence.
  • the non-contention random access of 55 allocates RAR resources, and then allocates RAR resources for the contention random access with the preamble sequence of ⁇ 18, 20, 22 ⁇ , so that when the RAR resources are limited, the non-contention random access can Get a priority response.
  • RAR in the RAR resource please refer to the specific description of the embodiment in FIG. 3.
  • the description of the MAC PDU including the MAC subheader and the MAC RAR in the method for the random access response in the embodiment of the present invention is described with reference to the embodiment shown in FIG. The detailed description will not be repeated here.
  • the random access response module 03 assigns the RAR to the contention random access corresponding to the contention random access preamble sequence in sequence. Resources.
  • the non-contention random access preamble sequence that may be triggered by the current time saved by the base station is ⁇ 50 ⁇
  • the matching preamble sequence detected by the preamble sequence acquisition module 01 at the current time is ⁇ 18, 20, 22, 55 ⁇
  • the random access judging module 02 determines that the non-contention random access preamble sequence 50 is not included
  • the random access response module 03 sequentially ranks the competition corresponding to the contention random access preamble sequence according to the order of the contention random access preamble sequence. Random access allocates RAR resources.
  • the base station when the base station detects both the contention random access preamble sequence and the non-contention random access preamble sequence at the same time, the base station preferentially responds to the non-contention random access preamble sequence when performing the RAR response;
  • the reason for the non-contention random access and the contention random access is corresponding to different random access scenarios, and the non-contention random access application is in the handover and uplink out-of-synchronization downlink data to the triggered random access scenario.
  • the contention random access can also be applied to the initial random access, the random access triggered by the reconstruction, and the uplink out-of-synchronization uplink data to the triggered random access.
  • the non-contention randomization requires higher access delay. Secondly, since the non-contention random access is a random access procedure dominated by the base station, the response of the base station to such access should have a higher priority. Third, when the base station performs random access detection, there is a possibility of false detection, and therefore, among the plurality of preamble sequences detected in the same ,, the probability of false detection corresponding to the non-contention random access preamble sequence is smaller than that of other contention random access preamble sequences. Therefore, the non-contention random access preamble sequence is preferentially responded.
  • the preamble sequence matching the preset range is obtained by searching on the PRACH, and the allocated non-contention random access preamble sequence is compared with the matched preamble sequence to determine that there is a non-existence in the matched preamble sequence.
  • the RAR resources are preferentially allocated for the non-contention random access corresponding to the non-contention random access preamble sequence, and when the multiple UEs simultaneously initiate random access, the base station performs different according to different access types. The beneficial effects of priority response improve resource utilization and overall system performance, and reduce non-contention random access latency.
  • FIG. 9 is a schematic structural diagram of a second embodiment of a random access response apparatus according to the present invention.
  • the difference between this embodiment and the first embodiment of the random access response apparatus of the present invention is that only a random access classification module is added.
  • the present embodiment is only described in detail for the random access classification module 04.
  • the other modules involved in the apparatus for random access response in this embodiment are as shown in FIG. 9 and are randomly selected in the embodiment of the present invention.
  • the device for accessing the response further includes:
  • the random access classification module 04 is configured to divide the matched preamble sequence into a non-contention random access preamble sequence and a contention random access preamble sequence.
  • the random access classification module 04 of the base station divides the available preamble sequences into a contention random access preamble sequence and a non-contention random access preamble sequence; for the contention random access and the non-contention random access base station, the base station can be known in advance. Because the triggering non-contention random access preamble sequence index is sent by the base station; therefore, when the base station simultaneously detects the contention random access preamble sequence and the non-contention random access preamble sequence at the same time, when performing the RAR response Priority response non-contention random access preamble sequence.
  • the preamble sequence acquisition module, the random access judgment module, the random access response module, and the random access classification module may be a central processing unit (CPU) in a device that responds by random access, and a digital signal processor.
  • CPU central processing unit
  • DSP Digital Signal Processor
  • FPGA Field - programmable Gate array
  • the matched preamble sequence is divided into a non-contention random access preamble sequence and a contention random access preamble sequence, and the subsequent base station simultaneously detects the contention random access preamble sequence and the non-contention random access at the same time.
  • the preamble sequence preferentially responds to the important premise of the non-contention random access preamble sequence, and has the beneficial effect of improving resource utilization.

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Abstract

本发明公开了一种随机接入响应的方法，包括：在物理随机接入信道（PRACH）上检索，获取与预置范围匹配的前导序列（S01）；将已分配的非竞争随机接入前导序列与匹配的前导序列进行比较，判断在匹配的前导序列中是否存在非竞争随机接入前导序列（S02）；确定存在非竞争随机接入前导序列时，为非竞争随机接入前导序列对应的非竞争随机接入分配随机接入响应（RAR）资源（S03）。本发明还公开了一种随机接入响应的装置。采用本发明，实现了多UE同时发起随机接入时基站根据不同接入类型进行不同优先级响应的有益效果，提高了资源利用率和系统整体性能，降低了非竞争随机接入时延。

Description

随机接入响应的方法及装置 技术领域
本发明涉及通信技术领域， 尤其涉及一种随机接入响应的方法及装置。 背景技术
随机接入是用户设备 ( UE, User Equipment )在开始和网络通信之前进 行的接入过程， 其目的是获得上行同步和 UE 身份标识。 随机接入信道 ( RACH, Random Access Channel )用于对还未得到或已经失去上行同步的 UE实现上行同步，一旦 UE完成上行同步，演进型基站（ eNB , evolved Node B )可以为 UE调度上行资源； 随机接入包含两种类型： 竟争随机接入和非 竟争随机接入。
其中， 竟争随机接入是指： 基站事先并未得知随机接入流程的发起， UE根据小区系统信息块（ SIB , System Information Block )信息来选取随机 接入的资源，包括发送物理随机接入信道（PRACH, Physical Random Access Channel ) 的时频资源以及前导序列索引； 因此当有多个 UE同时发起随机 接入流程时， 可能有多个 UE选择相同的随机接入资源； 由于同时接入的 UE个数受限， 同时发起接入的多个 UE之间就存在竟争关系，导致某些 UE 需要重新发起接入流程， 增加了接入时延。 非竟争随机接入是指： 基站预 先得知随机接入流程的发起，并为要发起随机接入流程的 UE指派特定的资 源。
基站在 PRACH上依次使用不同的前导序列进行检索，如果匹配，说明 存在 UE发起随机接入流程，则对其进行响应 ,即发送随机接入响应（ RAR, Random Access Response ) , 基站会对同一个传输时间间隔 （ ΤΉ , Transmission Time Interval ) 内检测出的多个前导序列进行响应； 当同一个 TTI内检测出多个前导序列， 且 MSG2中所能携带的 RAR个数少于检测出 的前导序列个数时， 基站需要决策优先对哪些前导序列进行响应， 而当前 协议中并未对上述情况给出明确的解决方法。 发明内容
本发明实施例的主要目的是提供一种随机接入响应的方法及装置， 旨 在实现多 UE同时发起随机接入时，基站根据不同接入类型进行不同的优先 级响应。
本发明实施例公开了一种随机接入响应的方法， 包括：
在 PRACH上检索， 获取与预置范围匹配的前导序列；
将已分配的非竟争随机接入前导序列与所述匹配的前导序列进行比 较， 判断在所述匹配的前导序列中是否存在非竟争随机接入前导序列； 确定存在非竟争随机接入前导序列时， 为所述非竟争随机接入前导序 列对应的非竟争随机接入分配 RAR资源。
优选地， 所述方法还包括步驟：
确定不存在非竟争随机接入前导序列时， 按照预置顺序为竟争随机接 入前导序列对应的竟争随机接入分配 RAR资源。
优选地， 所述将已分配的非竟争随机接入前导序列与所述匹配前导序 列进行比较， 判断在所述匹配的前导序列中是否存在非竟争随机接入之前， 所述方法还包括：
将所述匹配的前导序列划分为非竟争随机接入前导序列和竟争随机接 入前导序列。
优选地， 所述预置顺序包括所述竟争随机接入前导序列升序或降序。 本发明实施例还公开一种随机接入响应的装置， 包括：
前导序列获取模块， 配置为在 PRACH上检索， 获取与预置范围匹配的 随机接入判断模块， 配置为将已分配的非竟争随机接入前导序列与所 述匹配的前导序列进行比较， 判断在所述匹配的前导序列中是否存在非竟 争随机接入；
随机接入响应模块， 配置为确定所述匹配的前导序列中存在非竟争随 机接入前导序列时， 为所述非竟争随机接入前导序列对应的非竟争随机接 入分配 RAR资源。
优选地， 所述随机接入响应模块还配置为：
确定所述匹配的前导序列中不存在非竟争随机接入时， 按照预置顺序 为竟争随机接入前导序列对应的竟争随机接入分配 RAR资源。
优选地， 所述装置还包括：
随机接入分类模块， 配置为将所述匹配的前导序列划分为所述非竟争 随机接入前导序列和竟争随机接入前导序列。
本发明实施例通过在 PRACH上检索，获取与预置范围匹配的前导序列， 将已分配的非竟争随机接入前导序列与所述匹配的前导序列进行比较， 确 定匹配的前导序列中存在非竟争随机接入前导序列时， 为非竟争随机接入 前导序列对应的非竟争随机接入分配 RAR资源的方法， 实现了多 UE同时发 起随机接入时， 基站根据不同接入类型进行不同的优先级响应的有益效果， 提高了资源利用率和系统整体性能， 降低了非竟争随机接入时延。 附图说明
图 1是本发明随机接入响应的方法第一实施例流程示意图；
图 2是本发明实施例随机接入响应的方法中随机接入信号流图； 图 3是本发明实施例随机接入响应的方法中 RAR的成员结构示意图； 图 4是本发明随机接入响应的方法中包含 MAC子头和 MAC RAR的 MAC PDU示意图；
图 5是本发明随机接入响应的方法第二实施例流程示意图； 图 6是本发明实施例随机接入响应的方法中基于竟争的随机接入信号 流图；
图 7是本发明随机接入响应的方法第三实施例流程示意图；
图 8是本发明随机接入响应的装置第一实施例结构示意图；
图 9是本发明随机接入响应的装置第二实施例结构示意图。
本发明实施例目的的实现、 功能特点及优点将结合实施例， 参照附图 做进一步说明。 具体实施方式
以下结合说明书附图及具体实施例进一步说明本发明的技术方案。 应 当理解， 此处所描述的具体实施例仅仅用以解释本发明， 并不用于限定本 发明。
参照图 1 , 图 1是本发明随机接入响应的方法第一实施例流程示意图； 如图 1所示， 本发明实施例随机接入响应的方法包括以下步驟：
步驟 S01、 在 PRACH上检索， 获取与预置范围匹配的前导序列； 参照图 2,图 2为本发明实施例随机接入响应的方法中随机接入信号流 图， 包括： 步驟 201: 基站即 eNB向 UE发送系统公共信息 （ SIB/MIB ); 步驟 202: UE收到系统公共信息后， 向基站发送随机接入前导序列的 MSG1 ( Messenger, 即时消息）请求；
步驟 203: 基站收到 MSG1请求后， 向 UE返回随机接入前导序列的 MSG2响应；
这里， 基站依次遍历所有前导序列， 在 PRACH上进行检索， 找出所有 匹配的前导序列； 在一优选的实施例中， 前导序列的取值范围为 [0, 63]; 基站按照从小到大的顺序使用前导序列在 PRACH上进行检索，保存所有匹 配的前导序列， 如当前时刻检测出的匹配的前导序列为 { 18, 20, 22, 55}。
步驟 S02、将已分配的非竟争随机接入前导序列与所述匹配的前导序列 进行比较， 判断在所述匹配的前导序列中是否存在非竟争随机接入前导序 列; 若是， 则执行步驟 S03;
基站将保存的当前时刻可能触发的已分配的非竟争随机接入前导序列 与检索出的匹配的前导序列进行比较； 比如基站之前保存的非竟争随机接 入前导序列为 {50, 55 } , 在步驟 S01中已匹配的前导序列 { 18, 20, 22, 55 } 中进行查找； 前导序列为 55的非竟争随机接入前导序列存在， 说明此刻存 在非竟争随机接入。 若基站之前保存的非竟争随机接入前导序列为 {50} , 则在步驟 S01 中已匹配的前导序列中未查到， 则说明此刻未发生非竟争随 机接入。
步驟 S03、为所述非竟争随机接入前导序列对应的非竟争随机接入分配
RAR资源；
基站将保存的当前时刻可能触发的非竟争随机接入前导序列与检索出 的匹配的前导序列进行比较， 若检索出的前导序列中存在非竟争随机接入 前导序列， 则基站优先为非竟争随机接入前导序列对应的非竟争随机接入 分配 RAR资源； 在非竟争随机接入对应的 RAR资源分配结束后， 再进行 竟争随机接入前导序列对应的竟争随机接入对应的 RAR资源分配。具体地， 在一优选的实施例中 ,基站先为前导序列为 55的非竟争随机接入分配 RAR 资源， 然后再为前导序列为 { 18, 20, 22}的竟争随机接入分配 RAR资源， 这样保证在 RAR资源有限时， 非竟争随机接入能够得到优先响应。
在一优选的实施例中， 所述 RAR资源中 RAR的结构图请参照图 3本 发明实施例随机接入响应的方法中 RAR的成员结构示意图； 在一优选的实 施例中， RAR中携带的资源用于指示 UE在发送上行承载数据时使用的频 域位置和大小， 对应的描述字段为 RAR中的 UL Grant字段。 所述 RAR资 源包括用于承载上行负载的频域资源、时间调整量 TA及小区无线网络临时 标识 ( Temporary C-RNTI, Cell Radio Network Temporary Identifier )。 参照 图 4本发明实施例随机接入响应的方法中包含 MAC子头 （subheader )和 MAC RAR的 MAC PDU示意图， 如图 4所示， MAC PDU携带的 MAC subheader不包含在 MAC RAR资源内。
本实施例通过在 PRACH上检索， 获取与预置范围匹配的前导序列， 将 已分配的非竟争随机接入前导序列与所述匹配的前导序列进行比较， 确定 匹配的前导序列中存在非竟争随机接入前导序列时， 优先为非竟争随机接 入前导序列对应的非竟争随机接入分配 RAR资源的方法， 实现了多 UE同时 发起随机接入时， 基站根据不同接入类型进行不同的优先级响应的有益效 果， 提高了资源利用率和系统整体性能， 降低了非竟争随机接入时延。
参照图 5, 图 5是本发明随机接入响应的方法第二实施例流程示意图； 本实施例与本发明随机接入响应的方法第一实施例的区别是， 仅增加了步 驟 S04;本实施例仅对步驟 S04作具体描述，本实施例随机接入响应的方法 所涉及的其它步驟请参照相关实施例的具体描述， 在此不再赘述。
如图 5所示，本实施例随机接入响应的方法在步驟 S02、将保存的当前 前导序列与所述匹配的前导序列进行比较， 判断在所述匹配的前导序列中 是否存在非竟争随机接入前导序列之后， 该方法还包括：
步驟 S04、 若否， 则按照预置顺序为竟争随机接入前导序列对应的竟争 随机接入分配 RAR资源。
若检索出的前导序列中存在非竟争随机接入前导序列， 则基站优先为 非竟争随机接入前导序列对应的非竟争随机接入分配 RAR资源； 在非竟争 随机接入对应的 RAR资源分配结束后， 再按照随机接入前导的先后顺序为 竟争随机接入前导序列对应的竟争随机接入分配 RAR资源。 具体地， 例如 基站保存的当前时刻可能触发的非竟争随机接入前导序列为 {50} , 而当前 时刻检出的匹配前导序列为 { 18, 20, 22, 55 } , 其中不包含非竟争随机接 入前导序列 50, 则基站按照竟争随机接入前导序列的先后顺序依次为竟争 随机接入前导序列对应的竟争随机接入分配 RAR资源。 参照图 6本发明实 施例随机接入响应的方法中基于竟争的随机接入信号流图， 如图 6所示， 在竟争随机接入时， UE在可用的多个随机接入资源中进行随机选取。
在一优选的实施例中， 在同一时刻， 基站同时检测到竟争随机接入前 导序列和非竟争随机接入前导序列时， 进行 RAR响应时优先响应非竟争随 机接入前导序列； 这样做的原因是： 非竟争随机接入和竟争随机接入的流 程对应不同的随机接入场景， 非竟争随机接入应用在切换和上行失步下行 数据到触发的随机接入场景， 竟争随机接入除可应用以上两种场景外还可 应用于初始随机接入、 重建触发的随机接入以及上行失步上行数据到触发 的随机接入， 相比较而言， 非竟争随机接入流程应用的场景对接入时延要 求更高。 其次， 由于非竟争随机接入是由基站主导的随机接入流程， 因此 基站对于此类接入的响应理应优先级较高。 第三， 基站在进行随机接入检 测时， 存在误检的可能性， 因此同一个 ΤΉ 内检测出的多个前导序列中， 非竟争随机接入前导序列对应的误检概率小于其它竟争随机接入前导序 列。 因此， 优先响应非竟争随机接入前导序列。
本实施例通过确定匹配的前导序列中不存在非竟争随机接入前导序列 时， 按照预置顺序为竟争随机接入分配 RAR资源的方法， 具有提高系统资 源利用率的有益效果。
参照图 7, 图 7是本发明随机接入响应的方法第三实施例流程示意图； 本实施例与本发明随机接入响应的方法第二实施例的区别是， 仅增加了步 驟 S05; 本实施例仅对步驟 S05作具体描述，本实施例随机接入响应的方法 所涉及的其它步驟请参照相关实施例的具体描述， 在此不再赘述。
如图 7所示，本实施例随机接入响应的方法在步驟 S02、将保存的当前 前导序列与所述匹配的前导序列进行比较， 判断在所述匹配的前导序列中 是否存在非竟争随机接入前导序列之前， 该方法还包括： 步驟 S05、将所述匹配的前导序列划分为非竟争随机接入前导序列和竟 争随机接入前导序列。
基站将可用的前导序列分为竟争随机接入前导序列和非竟争随机接入 前导序列； 对于竟争随机接入和非竟争随机接入基站是可以提前获知， 因 为触发非竟争随机接入前导序列索引是由基站下发的； 因此当同一时刻基 站同时检测到竟争随机接入前导序列和非竟争随机接入前导序列时， 在进 行 RAR响应时优先响应非竟争随机接入前导序列。
本实施例将匹配的前导序列划分为非竟争随机接入前导序列和竟争随 机接入前导序列的方法， 是后续基站在同一时刻同时检测到竟争随机接入 前导序列和非竟争随机接入前导序列时优先响应非竟争随机接入前导序列 的重要前提， 具有提高资源利用率的有益效果。
参照图 8, 图 8是本发明随机接入响应的装置第一实施例结构示意图； 如图 8所示， 本发明实施例随机接入响应的装置包括：
前导序列获取模块 01 , 配置为在 PRACH上检索， 获取与预置范围匹配 的前导序列；
参照图 2本发明实施例随机接入响应的方法中随机接入信号流图， 包 括： 步驟 201 : 基站即 eNB向 UE发送系统公共信息 （ SIB/MIB );
步驟 202: UE收到系统公共信息后， 向基站发送随机接入前导序列的 MSG1 ( Messenger, 即时消息）请求；
步驟 203: 基站收到 MSG1请求后， 向 UE返回随机接入前导序列的 MSG2响应；
这里，基站的前导序列获取模块 01依次遍历所有前导序列，在 PRACH 上进行检索， 找出所有匹配的前导序列； 在一优选的实施例中， 前导序列 的取值范围为 [0, 63]; 前导序列获取模块 01按照从小到大或者从大到小的 顺序使用前导序列在在 PRACH上进行检索，保存所有匹配的前导序列，如 当前时刻检测出的匹配的前导序列为 { 18 , 20, 22, 55 }。
随机接入判断模块 02 , 配置为将已分配的非竟争随机接入前导序列与 所述匹配的前导序列进行比较， 判断在所述匹配的前导序列中是否存在非 竟争随机接入前导序列；
基站的随机接入判断模块 02将保存的当前时刻可能触发的已分配的非 竟争随机接入前导序列与检索出的匹配的前导序列进行比较； 比如基站之 前保存的非竟争随机接入前导序列为 {50, 55 } , 随机接入判断模块 02在前 导序列获取模块 01 已匹配的前导序列 { 18, 20, 22, 55 }中进行查找； 前导 序列为 55的非竟争随机接入前导序列存在，说明此刻存在非竟争随机接入。 若基站之前保存的非竟争随机接入前导序列为 {50} , 则随机接入判断模块 02在前导序列获耳 4莫块 01中已匹配的前导序列中未查到，则说明此刻未发 生非竟争随机接入。
随机接入响应模块 03 , 配置为确定所述匹配的前导序列中存在非竟争 随机接入前导序列时， 为所述非竟争随机接入前导序列对应的非竟争随机 接入分配 RAR资源；
所述随机接入响应模块 03还配置为， 确定所述匹配的前导序列中不存 在非竟争随机接入前导序列时， 按照预置顺序为竟争随机接入前导序列对 应的竟争随机接入分配 RAR资源。
随机接入判断模块 02将保存的当前时刻可能触发的非竟争随机接入前 导序列与检索出的匹配的前导序列进行比较， 若检索出的前导序列中存在 非竟争随机接入前导序列， 则随机接入响应模块 03优先为非竟争随机接入 前导序列对应的非竟争随机接入分配 RAR资源； 在非竟争随机接入对应的 RAR资源分配结束后，随机接入响应模块 03再按照预置顺序为竟争随机接 入前导序列对应的竟争随机接入分配 RAR资源。
具体地， 在一优选的实施例中， 随机接入响应模块 03先为前导序列为 55 的非竟争随机接入分配 RAR资源， 然后再为前导序列为 { 18, 20, 22} 的竟争随机接入分配 RAR资源， 这样保证在 RAR资源有限时， 非竟争随 机接入能够得到优先响应。 所述 RAR资源中 RAR的结构请参照图 3所述 实施例的具体描述， 本发明实施例随机接入响应的方法中包含 MAC subheader和 MAC RAR的 MAC PDU的描述请参照图 4所述实施例的具体 描述， 在此均不再赘述。
随机接入判断模块 02确定匹配的前导序列中不存在非竟争随机接入前 导序列时， 随机接入响应模块 03按照先后顺序为竟争随机接入前导序列对 应的竟争随机接入分配 RAR资源。 具体地， 例如基站保存的当前时刻可能 触发的非竟争随机接入前导序列为 {50} , 而当前时刻前导序列获取模块 01 检出的匹配前导序列为 { 18, 20, 22, 55} , 随机接入判断模块 02确定不包 含非竟争随机接入前导序列 50,则随机接入响应模块 03按照竟争随机接入 前导序列的先后顺序依次为竟争随机接入前导序列对应的竟争随机接入分 配 RAR资源。 本发明随机接入响应的方法中基于竟争的随机接入信号流图 请参照图 6所述实施例的具体描述， 在此不再赘述。
在一优选的实施例中， 在同一时刻， 基站同时检测到竟争随机接入前 导序列和非竟争随机接入前导序列时， 进行 RAR响应时优先响应非竟争随 机接入前导序列； 这样做的原因是： 非竟争随机接入和竟争随机接入的流 程对应不同的随机接入场景， 非竟争随机接入应用在切换和上行失步下行 数据到触发的随机接入场景， 竟争随机接入除可应用以上两种场景外还可 应用于初始随机接入、 重建触发的随机接入以及上行失步上行数据到触发 的随机接入， 相比较而言， 非竟争随机接入流程应用的场景对接入时延要 求更高。 其次， 由于非竟争随机接入是由基站主导的随机接入流程， 因此 基站对于此类接入的响应理应优先级较高。 第三， 基站在进行随机接入检 测时， 存在误检的可能性， 因此同一个 ΤΉ 内检测出的多个前导序列中， 非竟争随机接入前导序列对应的误检概率小于其它竟争随机接入前导序 列。 因此， 优先响应非竟争随机接入前导序列。
本实施例通过在 PRACH上检索， 获取与预置范围匹配的前导序列， 将 已分配的非竟争随机接入前导序列与所述匹配的前导序列进行比较， 确定 匹配的前导序列中存在非竟争随机接入前导序列时， 优先为非竟争随机接 入前导序列对应的非竟争随机接入分配 RAR资源， 实现了多 UE同时发起随 机接入时， 基站根据不同接入类型进行不同的优先级响应的有益效果， 提 高了资源利用率和系统整体性能， 降低了非竟争随机接入时延。
参照图 9, 图 9是本发明随机接入响应的装置第二实施例结构示意图； 本实施例与本发明随机接入响应的装置第一实施例的区别是， 仅增加了随 机接入分类模块 04; 本实施例仅对随机接入分类模块 04作具体描述； 本实 施例随机接入响应的装置所涉及的其它模块请参照相关实施例的具体描 如图 9所示， 本发明实施例随机接入响应的装置还包括：
随机接入分类模块 04 , 配置为将所述匹配的前导序列划分为非竟争随 机接入前导序列和竟争随机接入前导序列。
基站的随机接入分类模块 04将可用的前导序列分为竟争随机接入前导 序列和非竟争随机接入前导序列； 对于竟争随机接入和非竟争随机接入基 站是可以提前获知， 因为触发非竟争随机接入前导序列索引是由基站下发 的； 因此当同一时刻基站同时检测到竟争随机接入前导序列和非竟争随机 接入前导序列时， 在进行 RAR响应时优先响应非竟争随机接入前导序列。
实际应用时， 前导序列获取模块、 随机接入判断模块、 随机接入响应 模块以及随机接入分类模块可由随机接入响应的装置中的中央处理器 ( CPU, Central Processing Unit )、 数字信号处理器（DSP, Digital Signal Processor )或可编程逻辑阵歹1 J ( FPGA, Field - Programmable Gate Array ) 实现。
本实施例将匹配的前导序列划分为非竟争随机接入前导序列和竟争随 机接入前导序列， 是后续基站在同一时刻同时检测到竟争随机接入前导序 列和非竟争随机接入前导序列时优先响应非竟争随机接入前导序列的重要 前提， 具有提高资源利用率的有益效果。
以上所述仅为本发明的优选实施例， 并非因此限制其专利范围， 凡是 利用本发明说明书及附图内容所作的等效结构或等效流程变换， 直接或间 接运用在其他相关的技术领域， 均同理包括在本发明的专利保护范围内。

Claims

权利要求书
1、 一种随机接入响应的方法， 包括：
在物理随机接入信道 PRACH上检索，获取与预置范围匹配的前导序列； 将已分配的非竟争随机接入前导序列与所述匹配的前导序列进行比 较， 判断在所述匹配的前导序列中是否存在非竟争随机接入前导序列； 确定存在非竟争随机接入前导序列时， 为所述非竟争随机接入前导序 列对应的非竟争随机接入分配随机接入响应 RAR资源。
2、 如权利要求 1所述的随机接入响应的方法， 其中， 所述方法还包括： 确定不存在非竟争随机接入前导序列时， 按照预置顺序为竟争随机接 入前导序列对应的竟争随机接入分配 RAR资源。
3、 如权利要求 1或 2所述的随机接入响应的方法， 其中， 所述将已分配 的非竟争随机接入前导序列与所述匹配前导序列进行比较， 判断在所述匹 配的前导序列中是否存在非竟争随机接入之前， 所述方法还包括：
将所述匹配的前导序列划分为非竟争随机接入前导序列和竟争随机接 入前导序列。
4、 如权利要求 2所述的随机接入响应的方法， 其中， 所述预置顺序包 括所述竟争随机接入前导序列升序或降序。
5、 一种随机接入响应的装置， 包括：
前导序列获取模块， 配置为在 PRACH上检索， 获取与预置范围匹配的 前导序列；
随机接入判断模块， 配置为将已分配的非竟争随机接入前导序列与所 述匹配的前导序列进行比较， 判断在所述匹配的前导序列中是否存在非竟 争随机接入；
随机接入响应模块， 配置为确定所述匹配的前导序列中存在非竟争随 机接入前导序列时， 为所述非竟争随机接入前导序列对应的非竟争随机接 入分配 RAR资源。
6、 如权利要求 5所述的随机接入响应的装置， 其中， 所述随机接入响 应模块还配置为：
确定所述匹配的前导序列中不存在非竟争随机接入时， 按照预置顺序 为竟争随机接入前导序列对应的竟争随机接入分配 RAR资源。
7、 如权利要求 5或 6所述的随机接入响应的装置， 其中， 所述装置还包 括：
随机接入分类模块， 配置为将所述匹配的前导序列划分为非竟争随机 接入前导序列和竟争随机接入前导序列。
8、 如权利要求 6所述的随机接入响应的装置， 其中， 所述预置顺序包 括所述竟争随机接入前导序列升序或降序。
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