CN111465114B

CN111465114B - Random access response method and equipment

Info

Publication number: CN111465114B
Application number: CN201910049982.6A
Authority: CN
Inventors: 焦慧颖
Original assignee: China Academy of Information and Communications Technology CAICT
Current assignee: China Academy of Information and Communications Technology CAICT
Priority date: 2019-01-18
Filing date: 2019-01-18
Publication date: 2022-02-22
Anticipated expiration: 2039-01-18
Also published as: CN111465114A

Abstract

The application discloses a random access response method and equipment, wherein the method comprises the following steps: receiving a random access signal, and identifying terminal equipment and relay equipment; and sending a random access response signal which contains information for distinguishing the terminal equipment from the relay equipment. And distinguishing the terminal equipment and the relay equipment through RNTI, MAC CE signaling or CORSET and search space. The apparatus includes means for transmitting the random access response signal and means for receiving the random access response signal. The scheme of the application solves the problem of conflict existing when the terminal equipment and the relay equipment are accessed simultaneously, and sharing is achieved.

Description

Random access response method and equipment

Technical Field

The present application relates to the field of mobile communications technologies, and in particular, to a random access response method and device.

Background

When a relay node and a terminal coexist in a cell of a mobile communication system, both of them need to access a base station. Due to the difference of the transmission power and the coverage range of the relay and the terminal, the relay and the terminal adopt different time-frequency resources to transmit the random access sequence, and/or adopt different cyclic shifts to generate the random access sequence, and transmit the random access sequence to the base station. After the base station successfully decodes the random access sequence, a random access response is sent to the relay and the terminal, and in a system with the relay, the sent random access response is distinguished to be sent to the relay or the terminal.

Disclosure of Invention

The application provides a random access response method and equipment, which solve the problem of how to make a relay and a terminal identify the random access response sent to the relay and the terminal by a base station when the relay and the terminal exist at the same time.

The embodiment of the application provides a random access response method, which comprises the following steps:

receiving a random access signal, and identifying terminal equipment and relay equipment;

and sending a random access response signal which contains information for distinguishing the terminal equipment from the relay equipment.

Preferably, the information for distinguishing the terminal device from the relay device is an RNTI.

In an embodiment of the present application, the random access resources used by the terminal device and the relay device are different. Or the random access resources used by the terminal equipment and the relay equipment are the same, and the RNTI of the terminal equipment is calculated by using the random access resources; and the RNTI of the relay equipment is a relay node identification variable added in a standard calculation formula.

Preferably, the information for distinguishing the terminal device from the relay device is a bit in the MAC CE information of the random access response signal.

Preferably, the information for distinguishing the terminal device from the relay device is a downlink control resource group for transmitting a random access response signal. In a preferred embodiment of the present application, the search spaces of the terminal device and the relay device are different.

The embodiment of the present application further provides a device, which is used in the method according to any one of the embodiments of the present application, and the device receives a random access signal, and identifies a terminal device and a relay device; and sending a random access response signal which contains information for distinguishing the terminal equipment from the relay equipment.

The embodiment of the present application further provides a device, which is used in the method according to any one of the embodiments of the present application, where the device receives a random access response signal and identifies the information for distinguishing the terminal device from the relay device.

The embodiment of the application adopts at least one technical scheme which can achieve the following beneficial effects:

in a system with a relay, the terminal receives the random access response information sent to the terminal by the base station, and the relay receives the random access response information sent to the relay by the base station. The scheme of the application solves the conflict existing when the terminal equipment and the relay equipment are accessed simultaneously, and realizes sharing.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:

fig. 1 is a flowchart of an embodiment of a random access response method according to the present application;

FIG. 2 is a diagram of an embodiment of a MAC CE extension;

fig. 3 is a schematic diagram of the apparatus and system.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be described in detail and completely with reference to the following specific embodiments of the present application and the accompanying drawings. It should be apparent that the described embodiments are only some of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

The technical solutions provided by the embodiments of the present application are described in detail below with reference to the accompanying drawings.

Fig. 1 is a flowchart of an embodiment of a relay uplink access channel configuration method according to the present application.

and step 10, receiving the random access signal, and identifying the terminal equipment and the relay equipment.

The terminal equipment and the relay equipment respectively send out random access signals, and the random access signals use the same or different random access resources.

And 20, sending a random access response signal containing information for distinguishing the terminal equipment from the relay equipment.

For example, the base station may transmit two random access response messages (RARs), one for the terminal device and the other for the relay node.

Preferably, the information for distinguishing the terminal device from the relay device is an RNTI. On the basis of the existing RA-RNTI, a new IAB-RA-RNTI is introduced and is specially used for the terminal equipment, so that the terminal equipment and the relay equipment distinguish whether the access response signal is sent to the terminal equipment or not through different RA-RNTIs.

And step 30, receiving the random access response signal, and identifying the information for distinguishing the terminal equipment from the relay equipment.

For example, Random Access Response (RAR) information sent by the network device includes a relay identifier or a terminal identifier, and is used for distinguishing the relay device from the terminal device; the relay equipment receives the random access response signal, identifies the relay identification and acquires the random access response information; and the terminal equipment receives the random access response signal, identifies the terminal identification and acquires the random access response information.

An example of the RNTI in step 20 is specifically described below:

the value of the RA-RNTI of the prior art is calculated from the time-frequency domain location of the random access resource.

In an embodiment of the present application, the random access resources used by the terminal device and the relay device are different. In general, a plurality of RACH resources have been configured in the frequency domain in the system, so frequency domain multiplexing can be accomplished. However, in the time domain, the time domain resources are given by higher layer parameters, are included in the system information, and are common information to all terminal devices. When the relay node configures time resources or frequency resources different from those of the terminal, the calculated IAB-RA-RNTI for the relay device is different from the RA-RNTI for the terminal device.

Or, in another embodiment of the present application, the random access resources used by the terminal device and the relay device are the same, and the RNTI of the terminal device is calculated by using the random access resources; the IAB-RA-RNTI used for the relay equipment is a relay node identification variable added in a calculation formula when the RNTI of the terminal equipment is calculated.

For example: the calculation formula of RA-RNTI in the existing standard is as follows:

RA-RNTI＝1+s_id+14×t_id+14×80×f_id+14×80×8×ul_carrier_id

the identification variables included here are: s _ id refers to an index of a first OFDM symbol of the random access time domain resource, t _ id is an index of a first slot in a system frame, f _ id is an index of a frequency domain, and ul _ carrier _ id is an uplink carrier identity of the random access.

To distinguish the random access response to the terminal and the relay, the calculation of the new introduced IAB-RA-RNTI may be augmented with a relay node identification variable (IAB _ id), such as:

IAB-RA-RNTI＝1+s_id+14×t_id+14×80×f_id+14×80×8×ul_carrier_id+80×8×IAB_id

here, the IAB _ id is used as a relay identifier, and the identifier is 1 when a random access response is sent to the relay, and the identifier is 0 when the random access response is sent to the terminal.

Fig. 2 is a diagram of an embodiment of MAC CE extension.

Information for identifying a terminal or a relay is added to the reserved information in the MAC CE information of the RAR. And after decoding the downlink control channel scrambled by the RA-RNTI, the terminal acquires a response msg2 of the base station to the uplink access request, wherein one bit of reserved bits of the downlink channel is used for indicating whether the access response is given to the terminal node or the relay node.

For example, the MAC RAR information in the existing standard is shown in fig. 2 (3GPP38.211 Figure 6.2.3-1: MAC RAR), where the reserved byte identified by R can be used to identify the relay or the terminal.

An embodiment of distinguishing the terminal device and the relay device by a downlink control unit group (CORESET) in step 20 is specifically described herein.

The downlink control unit group occupied when sending the RAR is terminal-specific or relay-specific, and is used for distinguishing the RAR sent to the terminal or the relay.

For example, in the existing standard, the base station may configure a maximum of 3 downlink control units (CORESET) for the terminal, and correspond one of the configured CORESETs to the search of the random access response for relaying, and use the other two CORESETs to search the random access response for the terminal.

An embodiment of the step 20 relating to distinguishing the terminal device and the relay device by the search space is specifically described herein.

The search space occupied by transmitting RARs is terminal-specific or relay-specific, and is used to distinguish RARs transmitted to terminals or relays.

For example, the existing standard defines the time and frequency domain starting positions of each search space of the terminal, one or N of the search spaces are exclusively used for the search space of the relay random access response, and the rest of the search spaces are used for the search of the terminal random access response.

Fig. 3 is a schematic diagram of the apparatus and system.

The embodiment of the present application further provides a device, which is disposed in the base station device 60 and used in the method according to any embodiment of the present application, where the device receives a random access signal PRACH and identifies the relay device 61 and the terminal device 62; and sending a random access response signal which contains information d for distinguishing the terminal equipment from the relay equipment.

The embodiment of the present application further provides a device, which is used in the method according to any one of the embodiments of the present application, and the device is disposed in the relay device 61 or the terminal device 62, receives the random access response signal RAR, and identifies the information d for distinguishing the terminal device from the relay device.

Regarding the information d for distinguishing the terminal device and the relay device, in the present invention, the base station sends access response to the relay or the terminal, respectively, and can distinguish by a plurality of methods, one method is to introduce a new IAB-RA-RNTI for distinguishing, and add a parameter related to the relay node in the formula of calculation, for distinguishing the RNTI of the terminal and the RNTI of the relay node; one way is that a reserved bit in the MAC CE of the RAR is used to indicate whether it is for a relay node or a terminal node; one way is to differentiate relay nodes from terminal nodes with different sets of downlink control resources and search spaces.

As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects.

The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions.

It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

The above description is only an example of the present application and is not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims

1. a random access response method, is characterized in that, comprises the following steps:

Receive random access signals and identify terminal equipment and relay equipment;

Sending a random access response signal, including information for distinguishing terminal equipment and relay equipment; the information for distinguishing terminal equipment and relay equipment is at least one of the following information: RNTI, bits in the MAC CE information of the random access response signal , the downlink control resource group and search space for sending the random access response signal.

2 . The method according to claim 1 , wherein when the information for distinguishing the terminal equipment and the relay equipment is RNTI, the random access resources used by the terminal equipment and the relay equipment are the same, and the terminal equipment and the relay equipment use the same random access resources. 3 . The RNTI of the device is calculated by using the random access resources; the RNTI of the relay device is calculated by adding a relay node identification variable to the standard calculation formula.

3 . The method according to claim 1 , wherein when the information for distinguishing the terminal device and the relay device is RNTI, the random access resources used by the terminal device and the relay device are different. 4 .

4. A random access response device, used to implement the method according to any one of claims 1 to 3, wherein the random access response device,

Send a random access response signal, including information to distinguish terminal equipment and relay equipment.

5. A random access response device, used to implement the method according to any one of claims 1 to 3, wherein the random access response device,

A random access response signal is received, and the information for distinguishing the terminal device from the relay device is identified.