CN111465099B - Uplink access sharing method and equipment - Google Patents

Abstract

The application discloses an uplink access sharing method and equipment. An uplink access sharing method is used for the random access sequence of the terminal equipment to belong to a set of first random access sequences; the first random access sequence is generated by at least one root sequence through cyclic shift under the condition of a first step value; the random access sequence for the relay device belongs to a set of second random access sequences; the second random access sequence is generated by cyclic shift of the at least one root sequence under the condition of a second step value; the second step value is greater than the first step value. The uplink access configuration signaling contains an identification for indicating the first step value and/or the second step value. The application also provides equipment for receiving the configuration signaling, and circularly shifting at least one root sequence by using the first step value and the second step value to obtain a first random access sequence and a second random access sequence; a random access sequence for a terminal or relay is determined. The method and the device solve the problem that the terminal and the relay device share the random access resource.

Description

Uplink access sharing method and device

Technical Field

The present application relates to the field of mobile communication technology, and in particular to an uplink access sharing method, configuration signaling and device.

Background Art

When there are both relay devices and terminal devices in a cell, both need to access the base station. If the same random access resources are configured, the configuration of random access parameters is restricted. For example, due to the high power and capability of the relay device, when it is outside the cell radius of the main base station, it needs to try to access the main base station. Then when the main base station configures random access parameters for the terminal, it will match the relay device, and the GP and CP in the sent preamble format will be large to meet the access of the relay device, or the cyclic shift value will be large, thereby reducing the number of available cyclic shifts. This is unreasonable for terminal access within the cell radius. However, if the network configures independent random access resources for relay devices and terminal devices, it will greatly increase the signaling overhead, and is not conducive to the sharing of random access resources, affecting the access capacity.

Summary of the invention

The embodiments of the present application provide an uplink access sharing method, configuration signaling and device to solve the problem of a terminal and a relay device sharing random access resources.

An uplink access sharing method comprises the following steps: a random access sequence for a terminal device belongs to a set of first random access sequences; the first random access sequence is generated by cyclic shifting of at least one root sequence under a first step value; a random access sequence for a relay device belongs to a set of second random access sequences; the second random access sequence is generated by cyclic shifting of the at least one root sequence under a second step value; the second step value is greater than the first step value.

Preferably, the second step size value is a multiple of the first step size value.

Preferably, the set of second random access sequences includes part or all of the second random access sequences.

Preferably, the set of the first random access sequences excludes a first random access sequence that is the same as any of the second random access sequences.

Preferably, in any embodiment of the present application, the total number of random sequences included in the first random sequence set and the second random sequence set is 64.

An embodiment of the present application further proposes an uplink access configuration signaling, which is used in the method described in any embodiment of the present application, and the configuration signaling includes an identifier for indicating the first step value and/or the second step value.

An embodiment of the present application also proposes a device, used for the method described in any embodiment of the present application, the device is used to receive configuration signaling, the configuration signaling includes an identifier for indicating the second step value; cyclically shift at least one root sequence with the second step value to obtain the second random access sequence; determine all or part of the second random access sequence as a set of second random access sequences.

Preferably, the device is used to receive configuration signaling, the configuration signaling including an identifier for indicating the first step length value; cyclically shifting the at least one root sequence with the first step length value to obtain the first machine access sequence; excluding the part that is identical to the second random access sequence in all the first random access sequences, and determining it as a set of the first random access sequences.

Further preferably, the random access sequence sent by the device belongs to a set of the first random access sequences or a set of the second random access sequences.

An embodiment of the present application further proposes a device that sends the configuration signaling, receives the random access sequence, and determines that the random access sequence belongs to the set of the first random access sequences or the set of the second random access sequences.

At least one of the above technical solutions adopted in the embodiments of the present application can achieve the following beneficial effects:

The method proposed in this patent allows the relay device and the terminal device to share the same random access resources, which has the advantage of being able to fully utilize the random access resources.

BRIEF DESCRIPTION OF THE DRAWINGS

The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

FIG1 is a schematic diagram of a cell including a relay device and a terminal device;

FIG2 is a flow chart of an embodiment of an uplink access channel sharing method of the present invention;

FIG3 is a schematic diagram of a set of random access sequences when the second step length is a multiple of the first step length;

FIG4 is a schematic diagram showing that a set of second random access sequences includes a part of second random access sequences.

DETAILED DESCRIPTION

In order to make the purpose, technical solution and advantages of the present application clearer, the technical solution of the present application will be clearly and completely described below in combination with the specific embodiments of the present application and the corresponding drawings. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

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

Figure 1 is a schematic diagram of a cell including a relay device and a terminal device. A relay device 61 and a terminal device 62 exist in the cell at the same time, and both can access a base station 60. The relay device and the terminal device each send a random access sequence, and the base station device sends a random access response after identifying it.

The generation formula of the random access sequence x _u,v (n) is as follows, where the base sequence is x _u (i), C _v is the cyclic shift, and L _RA is the length of the sequence.

x _u,v (n)=x _u ((n+C _v )modL _RA )

When the _LRA length is 139 and the cyclic shift step value _Ncs = 10, the number of cyclic shifts v is 139/10 rounded down to 13, and the value of _Cv is 0, 10, 20, ..., 120. One root sequence is used to generate 13 random access sequences. To generate 64 random access sequences, a total of 5 root sequences are required.

It should be noted that the selected cyclic shift value is related to the cell radius. Assume that there are two terminals, UE1 is at the edge of the cell, and UE2 is closer to the eNB. UE1 uses a cyclic shift value of 0, and UE2 uses a cyclic shift value of N _cs . From the perspective of the eNB, due to the existence of transmission delay, the cyclic shift value of UE1 is not 0 but other values X. As long as the value X is less than Ncs, the value of the autocorrelation between X and N _cs is 0, so that the eNB will be able to distinguish UE1 and UE2 during the access process. This is the characteristic of the ZC sequence. Therefore, the maximum coverage radius of the cell is limited by the cyclic shift value.

FIG. 2 is a flow chart of an embodiment of the uplink access channel sharing method of the present invention.

Step 10: Send an uplink access configuration signaling, wherein the configuration signaling includes an identifier for indicating the first step length value and/or a second step length value. The second step length value is greater than the first step length value.

When the uplink access configuration signaling is sent to the terminal device, it at least includes the first step length value; when the uplink access configuration signaling is sent to the relay device, it at least includes the second step length value.

Considering that the access radius of the relay device is larger than that of the terminal device, when the terminal and the relay are configured with the same resources, for the same ZC root sequence, two cyclic shift step values N _cs can be defined. The small N _cs is used for terminal device access, and the large N _cs is used for relay device access.

The prior art obtains the cyclic shift step size through a high-level configuration parameter (zeroCorrelationZoneConfig). To support different cyclic shift step sizes for relays and terminals, two high-level configuration parameters are introduced, one for the terminal configuration parameter (zeroCorrelationZoneConfig_UE), i.e., the identifier of the first step size value, used to obtain a relatively small cyclic shift step size value, and the other for the relay configuration parameter (zeroCorrelationZoneConfig_IAB), i.e., the identifier of the second step size value, used to obtain a relatively large cyclic shift step size value.

Taking the following table as an example, the value setting range of the first step length value identifier (zeroCorrelationZoneConfig_UE) used for the terminal device is 0 to 10, and the corresponding first step length value is the N _CS value in rows 0 to 10 in the table; the value setting range of the second step length value identifier (zeroCorrelationZoneConfig_IAB) used for the relay device is 11 to 15, and the second step length value is the N _cs value in rows 11 to 15 in the table; this ensures that the cyclic shift of the terminal device is smaller and the cyclic shift of the relay device is larger.

Table 1. First step length value (or second step length value) identification index table

(The values in the above table are only for example. The specific parameters are taken from "Table 6.3.3.1-7: N _cs for preamble formats with Δf ^RA ＝15·2 ^μ kHz where μ∈{0,1,2,3}" in 3GPP standard 38.211)

Step 20: Receive configuration signaling, and cyclically shift at least one root sequence using the first step value or the second step value to obtain a random access sequence.

The existing mechanism is to obtain the root sequence and step value for generating random access sequences by configuring parameters at a high level until a total of 64 random access sequences are generated. For example, 13 random access sequences are generated using one root sequence. To generate 64 random access sequences, a total of 5 root sequences are required.

For example, the relay device receives configuration signaling, wherein the configuration signaling includes an identifier for indicating the second step value; cyclically shifts at least one root sequence using the second step value to obtain the second random access sequence; and determines all or part of the second random access sequence as a set of the second random access sequences.

For another example, a terminal device receives configuration signaling, wherein the configuration signaling includes an identifier for indicating the first step length value; cyclically shifts the at least one root sequence using the first step length value to obtain the first machine access sequence; and excludes the part that is identical to the second random access sequence in all the first random access sequences to determine the set of the first random access sequences.

The random access sequence used for the terminal device belongs to the set of first random access sequences; the random access sequence used for the relay device belongs to the set of second random access sequences.

Step 30: Send the random access sequence, where the random access sequence belongs to a set of the first random access sequences or a set of the second random access sequences;

The random access sequence sent by the terminal device is the first random access sequence, which is generated by cyclic shifting of at least one root sequence under the first step length value condition.

The random access sequence sent by the relay device is the second random access sequence, which is generated by cyclically shifting the at least one root sequence under the second step value condition.

Step 40: Receive the random access sequence, and determine whether the random access sequence belongs to the set of the first random access sequences or the set of the second random access sequences;

FIG3 is a schematic diagram of a set of random access sequences when the second step length is a multiple of the first step length.

As an optimized embodiment of the present invention, the second step value is a multiple of the first step value. In the set of the first random access sequences, a first random access sequence that is identical to any one in the set of the second random access sequences is excluded. The total number of random sequences included in the first random sequence set and the second random sequence set is 64.

To support different cyclic shifts for relay devices and terminal devices, the base station side configures the cyclic shift step of the relay device to be a multiple N (N is a positive integer) of the cyclic shift of the terminal device according to the coverage range of the covered relay device, to ensure that the relay device uses a cyclic shift step N times larger than that of the terminal to generate a random access sequence, thereby meeting the requirements of inconsistent coverage ranges of the relay device and the terminal.

It should be pointed out here that, since the random access rate of the relay device is relatively low, it can generate fewer random access sequences than the terminal.

As shown in FIG3 , for a terminal device, when the high-layer configuration N _cs =10, each ZC sequence requires 13 cyclic shifts to generate a random access sequence, and a total of 5 ZC sequences are required to generate a total of 64 random access sequences according to the cyclic shift. Each square in the figure represents a random access sequence;

According to the high-level configuration of this patent, the relay device configures a step value of 4 times the size, that is, N _cs = 40 to generate a random access sequence. Each root sequence generates 3 cyclic shift random access sequences, and 15 random access sequences for the relay device can be generated. The specific cyclic shift value C _v is 0, 40, and 80. Each square in the figure represents a random access sequence, and the gray square represents a set of second random access sequences. In the embodiment shown in Figure 3, the set of the second random access sequences includes all of the second random access sequences.

To avoid conflicts, all N-fold cyclic shifts are used for relay devices, and the remaining cyclic shifts are used for terminals. In the example, C _v = 0, 40 and 80 are used for relay devices. Finally, the number of random access sequences used for relays is 15, and the number of random access sequences used for terminals is 49. That is, among all the first random sequences, the parts that overlap with the gray blocks (indicated by ×) are removed to obtain a set of first random sequences.

FIG4 is a schematic diagram showing that a set of second random access sequences includes a part of second random access sequences.

Preferably, the set of the second random access sequences includes part of the second random access sequences. In the set of the first random access sequences, the first random access sequences that are identical to any one in the set of the second random access sequences are excluded. The total number of random sequences included in the first random sequence set and the second random sequence set is 64.

The base station configures the terminal and the relay with their dedicated root sequences and cyclic shifts to ensure the dedicated access sequences for the terminal and the relay. As shown in FIG4 , the terminal device high-level configuration N _cs = 10 and the relay device N _cs = 40 are still taken. The terminal generates C _v = 40, 50, ..., 120 for the random access sequence at the second root sequence, and the relay generates C _v = 0 for the random access sequence at the second root sequence. The terminal generates C v = 0, 10, 20, 30, 80, 90, 100, 110, 120 for the random access sequence at the fourth root sequence; the relay generates C _{v = 40 for the random access sequence at the third root sequence. The terminal generates C v =} 0, 10, 20, 30, 40, 50, 60, 70, 120 for the random access sequence at the fifth root sequence; the relay generates C _v = 80 for the random access sequence at the _fifth root sequence. Each square in the figure represents a random access sequence, and the gray square represents the set of second random access sequences, which is a specified part of all second random access sequences (the rest are indicated by crosses). In this example, the number of random access sequences used for relay is 3. Among all the first random sequences, the part overlapping with the gray square is removed (indicated by crosses), and the set of first random sequences is obtained. The number of random access sequences used for terminals is 61.

In the present invention, the terminal and the relay device share the same sequence, and two cyclic shift step values are introduced. The design principle is that a small step value is used for the terminal device and a large step value is used for the relay device. There are three indication methods, one is to divide the configurable step value into two categories, so that a slightly larger step value is used for the relay device and the other small step value is used for the terminal device, another is to indicate that the step value of the relay device is a multiple of the step value of the terminal device, and the third is to directly configure a part of the random access sequences with a high step value among the generated 64 access sequences for the relay device to use.

An embodiment of the present application also proposes a device, used for the method described in any embodiment of the present application, the device is used to receive configuration signaling, the configuration signaling includes an identifier for indicating the second step value; cyclically shift at least one root sequence with the second step value to obtain the second random access sequence; determine all or part of the second random access sequence as a set of second random access sequences.

Preferably, the device is used to receive configuration signaling, which includes an identifier for indicating the first step length value; cyclically shifting the at least one root sequence with the first step length value to obtain the first random access sequence; excluding the part that is identical to the second random access sequence in all the first random access sequences, and determining it as a set of the first random access sequences.

Further preferably, the random access sequence sent by the device belongs to the set of the first random access sequences or the set of the second random access sequences. When the device is set in the terminal device 62, the random access sequence belongs to the set of the first random access sequences; when the device is set in the relay device 61, the random access sequence belongs to the set of the second random access sequences.

The embodiment of the present application further proposes a device, which, when configured in the base station device 60, sends the configuration signaling, receives the random access sequence, and determines whether the random access sequence belongs to the set of the first random access sequences or the set of the second random access sequences.

It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. The present invention is described with reference to the flowcharts and/or block diagrams of the methods, devices (systems), and computer program products according to embodiments of the present invention. It will be appreciated that each flow and/or box in the flow chart and/or block diagram, and the combination of the flow chart and/or box in the flow chart and/or block diagram may be implemented by computer program instructions.

It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the process, method, commodity or device including the elements.

The above is only an embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. 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 (8)

1. An uplink access sharing method, characterized in that: A random access sequence for a terminal device, belonging to a set of first random access sequences; the first random access sequence is generated by cyclic shifting of at least one root sequence under a first step length value condition; A random access sequence for a relay device, belonging to a set of second random access sequences; the second random access sequence is generated by cyclically shifting the at least one root sequence under a second step value condition; The second step value is greater than the first step value; and in the set of the first random access sequences, a first random access sequence that is identical to any one in the set of the second random access sequences is excluded. 2. The method according to claim 1, characterized in that: The second step size value is a multiple of the first step size value. 3. The method according to claim 1 or 2, characterized in that: The set of second random access sequences includes part or all of the second random access sequences. 4. An uplink access sharing device, used to implement the method according to any one of claims 1 to 3, characterized in that: receiving a configuration signaling including an identifier for indicating the second step value; The at least one root sequence is cyclically shifted using the second step value to obtain the second random access sequence; and all or part of the second random access sequences are determined as a set of second random access sequences. 5. The uplink access sharing device according to claim 4 is arranged in a terminal device or a relay device, characterized in that: sending the random access sequence, which belongs to a set of the first random access sequences or a set of the second random access sequences; When set in a terminal device, the random access sequence belongs to the set of the first random access sequences; when set in a relay device, the random access sequence belongs to the set of the second random access sequences. 6. An uplink access sharing device, used to implement the method according to any one of claims 1 to 3, characterized in that: receiving a configuration signaling including an identifier for indicating the first step length value; The at least one root sequence is cyclically shifted using the first step length value to obtain the first random access sequence; and the same part as the set of the second random access sequences is excluded from all the first random access sequences to determine the set of the first random access sequences. 7. The uplink access sharing device according to claim 6, which is arranged in a terminal device or a relay device, and is characterized in that: sending the random access sequence, which belongs to a set of the first random access sequences or a set of the second random access sequences; When set in a terminal device, the random access sequence belongs to the set of the first random access sequences; when set in a relay device, the random access sequence belongs to the set of the second random access sequences. 8. An uplink access sharing device, arranged in a base station device, for implementing the method according to any one of claims 1 to 3, characterized in that: Sending a configuration signaling, wherein the configuration signaling includes an identifier for indicating the first step length value and/or the second step length value; The random access sequence is received, and it is determined whether the random access sequence belongs to a set of the first random access sequences or a set of the second random access sequences.

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