CN110933768A - Random access response method in wireless communication system - Google Patents
Random access response method in wireless communication system Download PDFInfo
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- CN110933768A CN110933768A CN201911251718.7A CN201911251718A CN110933768A CN 110933768 A CN110933768 A CN 110933768A CN 201911251718 A CN201911251718 A CN 201911251718A CN 110933768 A CN110933768 A CN 110933768A
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- random access
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- authorization
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access, e.g. scheduled or random access
- H04W74/08—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access]
- H04W74/0833—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access] using a random access procedure
Abstract
The invention discloses a random access response method in a wireless communication system, which comprises the following steps: a network side configures random access request resources used by a terminal through broadcast or unicast messages; the terminal uses the pre-configured random access request resource to initiate a random access request (MSGA) message; in the random access response, the network side allocates different UL grant uplink grant sizes for the terminal according to the MSGA message; if the terminal needs to perform retransmission/rollback operation, corresponding uplink authorization is adopted; and the terminal sends an uplink data packet or a message to the network side according to the uplink authorization indicated by the network. In the two-step random access, the network side can select and use different resource positions during retransmission by configuring different uplink authorization positions and sizes for the terminal, so that the probability of collision is reduced, the access success rate is improved, and air interface resources are flexibly utilized.
Description
Technical Field
The invention relates to the field of communication, in particular to a random access response method in a wireless communication system.
Background
Random access of an LTE (Long Term Evolution) system is divided into two types, namely contention random access and non-contention random access. Wherein the content of the first and second substances,
conventional contention-based four-step random access:
in the air interface random access process of the existing mobile communication system (4G LTE and 5G NR), the random access is generally completed through the following steps:
the terminal sends a preamble sequence (MSG 1) on a pre-configured time/frequency resource;
the network side receives the leader sequence (random access request) of the terminal and sends a random access response (MSG 2); the terminal may include a preamble sequence identifier (RAPID), a Time Advance (TA), an uplink grant (UL grant), a Backoff Indicator (BI), a transient temporary connection identifier (TC-RNTI), and the like corresponding to the terminal, and the message uses a random access temporary identifier (RA-RNTI) scrambling code;
after receiving the corresponding MSG2, the terminal transmits MSG3 using the resource location indicated by the UL grant therein. The MSG3 contains the contention resolution ID of the terminal;
after receiving the MSG3, the network completes the contention resolution and sends MSG4 to the terminal;
and after receiving the competition resolving ID of the MSG4, the terminal upgrades the TC-RNTI to the C-RNTI and sends an MSG5 completion message to the network.
Generally, the contention-based random access has been completed in the first four steps, and is therefore referred to as four-step random access. The above procedure is prior art and has been written into the 3GPP standard.
Conventional contention-based two-step random access:
in the air interface random access process enhancement of the new mobile communication system, the random access may also be completed through the following two steps:
the terminal sends a preamble sequence and uplink data on a pre-configured time/frequency resource, wherein the preamble sequence and the uplink data comprise a load of a message 3 in four-step random access (MSGA = MSG1+ MSG 3);
after receiving MSGA (random access request) of a terminal, a network side sends a random access response (MSGB); MSGB = MSG2+ MSG 4.
The two-step competition random access is a research hotspot of the random access of the current 5G system, and each lead code only corresponds to one grant size when a random access request is made at present; in the random access response RAR, the network has only one uplink grant for a terminal with respect to a preamble sequence sent by the terminal. In the two-step random access currently under discussion, the relationship between the preamble sequence and the uplink data channel PUSCH (i.e., the uplink grant used in MSG 3) is not determined, and there may be multiple corresponding uplink grant sizes for one preamble sequence.
In the two-step random access, since it is contention, there is a possibility that the random access fails. When the random access fails, the terminal needs to reinitiate the access request. The network side cannot instruct the terminal to initiate subsequent access requests or back-off on different resources, so that the resources used by the terminal next time are similar, and the probability of continuing collision next time is high.
Disclosure of Invention
In view of the above, a method for random access response in a wireless communication system is provided.
The object of the invention is achieved in the following way:
a random access response method in a wireless communication system, the method comprising:
a network side configures random access request resources used by a terminal through broadcast or unicast messages;
the terminal uses the pre-configured random access request resource to initiate a random access request (MSGA) message;
in the random access response, the network side allocates different UL grant uplink grant sizes for the terminal according to the MSGA message;
if the terminal needs to perform retransmission/rollback operation, corresponding uplink authorization is adopted;
and the terminal sends an uplink data packet or a message to the network side according to the uplink authorization indicated by the network.
The pre-configured random access request resource comprises a preamble sequence, a random access opportunity and an uplink data shared channel (PUSCH).
The relation among the three elements of the preamble sequence, the random access opportunity and the uplink data shared channel PUSCH is one-to-one, one-to-many, many-to-many or many-to-one mapping.
The MSGA message comprises the relationship of each element in the pre-configured random access request resource.
The uplink grant comprises a position and a size.
The method for the network indicated uplink authorization comprises the following steps:
the network side displays an authorization number or a position for indicating the next transmission;
the network side implicitly indicates the authorization number or position used for next transmission, and the authorization number or position is obtained by presetting or judging other information elements;
the terminal automatically selects the Nth authorization number or position in all the available authorization numbers, wherein N is a natural number which is configured in advance and does not include zero;
the terminal randomly selects the first of all available authorization numbers or locations on its own.
A computer readable storage medium having stored thereon computer instructions which, when executed by a processor, carry out the steps of the method described above.
Compared with the prior art, in the two-step random access, the invention can ensure that the network side can select and use different resource positions during retransmission by configuring different uplink authorization positions and sizes for the terminal, thereby reducing the probability of collision, improving the access success rate and flexibly utilizing air interface resources.
Drawings
FIG. 1 is a flow chart of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same technical meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise, and it should be further understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of the stated features, steps, operations, devices, components, and/or combinations thereof.
A random access response method in a wireless communication system, the method comprising:
a network side configures random access request resources used by a terminal through broadcast or unicast messages;
the terminal uses the pre-configured random access request resource to initiate a random access request (MSGA) message;
in the random access response, the network side allocates different UL grant uplink grant sizes for the terminal according to the MSGA message;
if the terminal needs to perform retransmission/rollback operation, adopting uplink authorization indicated by a corresponding network;
and the terminal sends an uplink data packet or a message to the network side according to the uplink authorization indicated by the network.
The pre-configured random access request resource comprises a preamble sequence, a random access opportunity and an uplink data shared channel (PUSCH).
The relation among the three elements of the preamble sequence, the random access opportunity and the uplink data shared channel PUSCH is one-to-one, one-to-many, many-to-many or many-to-one mapping.
The MSGA message comprises the relationship of each element in the pre-configured random access request resource.
The uplink grant comprises a position and a size.
The method for the network indicated uplink authorization comprises the following steps:
the network side displays an authorization number or a position for indicating the next transmission;
the network side implicitly indicates the authorization number or the location used for the next transmission, for example, by means of a predetermined (default configuration, transmission is performed at a predetermined location once failure occurs), or by determining other information elements;
the terminal automatically selects the Nth authorization number or position in all the available authorization numbers, wherein N is a natural number which is configured in advance and does not include zero;
the terminal randomly selects the first of all available authorization numbers or locations on its own.
A computer readable storage medium having stored thereon computer instructions which, when executed by a processor, carry out the steps of the method described above.
According to the invention, different resources are configured in the random access request, and the random access response carries optional resources, so that the terminal UE can avoid busy channels, and the access success rate is improved.
The network side configures random access request resources used by the terminal through broadcast or unicast messages, wherein the random access request resources comprise:
a preamble sequence;
random access timing;
an uplink data shared channel PUSCH;
the element relationships may be one-to-one, one-to-many, many-to-one mappings.
The terminal initiates a random access request using a pre-configured relationship (MSGA = preamble sequence/RO random access occasion/PUSCH)
In the random access response, the network side may allocate different UL Grant uplink Grant sizes to the terminal according to the correspondence between the foregoing elements, for example, (Grant 1, Grant2 ….), and when the terminal needs to perform retransmission/backoff operation, the network side may use the corresponding uplink Grant, where the uplink Grant includes a location and a size. The fallback is a process of switching from two-step access to four-step access as indicated by the network.
The terminal sends an uplink data packet or a message according to the uplink authorization allocated by the network, wherein the method for indicating allocation by the network comprises the following steps:
the network side displays an authorization number or a position for indicating the next transmission;
the network side implicitly indicates the authorization number or position used for next transmission, such as by appointment in advance, or judges other information elements;
the terminal automatically selects the Nth of all available authorization numbers or positions, wherein N is a natural number which is configured in advance and does not include zero;
the terminal randomly selects the first of all available authorization numbers or locations by itself.
In the two-step random access, the network side can select and use different resource positions during retransmission by configuring different uplink authorization positions and sizes for the terminal, so that the probability of collision is reduced, the access success rate is improved, and air interface resources are flexibly utilized.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Although the embodiments of the present invention have been described with reference to the accompanying drawings, it is not intended to limit the scope of the present invention, and it should be understood by those skilled in the art that various modifications and variations can be made without inventive efforts by those skilled in the art based on the technical solution of the present invention.
Claims (7)
1. A random access response method in a wireless communication system, characterized in that: the method comprises the following steps:
a network side configures random access request resources used by a terminal through broadcast or unicast messages;
the terminal uses the pre-configured random access request resource to initiate a random access request (MSGA) message;
in the random access response, the network side allocates different UL grant uplink grant sizes for the terminal according to the MSGA message;
if the terminal needs to perform retransmission/rollback operation, corresponding uplink authorization is adopted;
and the terminal sends an uplink data packet or a message to the network side according to the uplink authorization indicated by the network.
2. The random access response method in a wireless communication system according to claim 1, wherein: the pre-configured random access request resource comprises a preamble sequence, a random access opportunity and an uplink data shared channel (PUSCH).
3. The random access response method in a wireless communication system according to claim 2, wherein: the relation among the three elements of the preamble sequence, the random access opportunity and the uplink data shared channel PUSCH is one-to-one, one-to-many, many-to-many or many-to-one mapping.
4. The random access response method in a wireless communication system according to claim 1, wherein: the MSGA message comprises the relationship of each element in the pre-configured random access request resource.
5. The random access response method in a wireless communication system according to claim 1, wherein: the uplink grant comprises a position and a size.
6. The random access response method in a wireless communication system according to claim 1, wherein: the method for the network indicated uplink authorization comprises the following steps:
the network side displays an authorization number or a position for indicating the next transmission;
the network side implicitly indicates the authorization number or position used for next transmission, and the authorization number or position is obtained by presetting or judging other information elements;
the terminal automatically selects the Nth authorization number or position in all the available authorization numbers, wherein N is a natural number which is configured in advance and does not include zero;
the terminal randomly selects the first of all available authorization numbers or locations on its own.
7. A computer-readable storage medium having stored thereon computer instructions, characterized in that the instructions, when executed by a processor, carry out the steps of the method according to any one of claims 1-6.
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| CN106411475A (en) * | 2015-07-27 | 2017-02-15 | 中兴通讯股份有限公司 | Feedback transmission method and device |
| CN107872899A (en) * | 2016-09-23 | 2018-04-03 | 中兴通讯股份有限公司 | A kind of accidental access method, device and equipment |
| CN109587769A (en) * | 2017-09-28 | 2019-04-05 | 中兴通讯股份有限公司 | A kind of data transmission method and device, search space optimization method and device |
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Application publication date: 20200327 |