Resource allocation method in satellite communication random access process

Abstract

The invention discloses a resource allocation method in a satellite communication random access process, and belongs to the field of wireless communication systems. Comprising the following steps: performing downlink resource allocation indication; indicating whether the random access response contains downlink resource allocation or not through a downlink resource allocation indication; and simultaneously performing uplink resource allocation and downlink resource allocation through random access response. According to the method for simultaneously allocating the uplink resource and the downlink resource through the RAR, the terminal can directly receive the downlink signal from the downlink resource allocated in the RAR without receiving the downlink resource allocation again, so that the resource allocation flow of the random access process between the terminal and the network can be simplified, the random access process and the terminal network access completion time can be shortened, and meanwhile, the network access efficiency can be improved. In resource allocation, resource allocation within effective time is adopted, and the flexibility of resource allocation in RAR is improved.

Description

Technical Field

[0001] The invention belongs to the field of wireless communication systems, and in particular relates to a resource allocation method in a satellite communication random access process. Background Art

[0002] In the random access process of existing 4G and 5G communication systems, RAR (Random Access Response) only allocates uplink resources, not downlink resources. The uplink and downlink resources after RAR are allocated through subsequent DCI. In the random access process of existing satellite communication systems, the resource allocation in RAR is similar to that of 5G systems.

[0003] In the existing 4G and 5G technologies, RAR only allocates uplink resources but not downlink resources, which causes the terminal to need to receive the downlink signal again to obtain the downlink resource allocation, thereby increasing the time to complete the random access process and the time it takes for the terminal to complete the network access. During the random access process of the existing satellite communication system, the resource allocation method in RAR lacks flexibility and cannot flexibly allocate resources based on the distance relationship between the satellite and the terminal. The present application simplifies the resource allocation process of the random access process between the terminal and the network by using a method in which RAR simultaneously allocates uplink resources and downlink resources, shortens the random access process and the time it takes to complete the terminal network access. At the same time, in resource allocation, resource allocation within the effective time is adopted to increase the flexibility of resource allocation in RAR. Summary of the invention

[0004] In view of the above technical problems existing in the prior art, the present invention proposes a resource allocation method in the random access process of satellite communication, which has a reasonable design, overcomes the shortcomings of the prior art and has good effects.

[0005] In order to achieve the above object, the present invention adopts the following technical solution:

[0006] A method for allocating resources in a satellite communication random access process comprises the following steps:

[0007] Step 1: Provide downlink resource allocation instructions;

[0008] Indicating, by means of a downlink resource allocation indication, whether the random access response includes downlink resource allocation;

[0009] Step 2: Perform uplink resource allocation and downlink resource allocation simultaneously through random access response.

[0010] Preferably, both uplink resource allocation and downlink resource allocation include frequency domain resources and time domain resources.

[0011] Preferably, the frequency domain resource includes a frequency / RB indication;

[0012] The frequency / RB indication is configured to indicate whether the frequency domain resource parameter carries a frequency parameter or an RB parameter;

[0013] When "Frequency / RB indication" indicates frequency, the frequency domain resource parameters include frequency band, frequency, and sub-frequency;

[0014] When the "frequency / RB indication" indicates RB, the frequency domain resource parameters include RB start and RB length.

[0015] Preferably, the frequency domain resources also include frequency domain resource parameters;

[0016] Time domain resources include subframe allocation quantity / valid time indication and time domain resource parameters;

[0017] The subframe allocation quantity / valid time indication is configured to indicate whether the time domain resource parameter carries the subframe allocation quantity or the valid time;

[0018] When the “Subframe Allocation Quantity / Valid Time Indication” indicates the subframe allocation quantity, the time domain resource parameters include the subframe starting position n, the subframe interval k and the allocation quantity j, and subframe n, subframe n+k, ..., subframe n+k*(j-1) are the allocated time domain resources;

[0019] When the "Subframe Allocation Number / Valid Time Indication" indicates the valid time, the time domain resource parameters include the subframe starting position n, the subframe interval k and the valid time t, subframe n, subframe n+k, ... subframe is the allocated time domain resource.

[0020] Preferably, the effective time includes a direction indication, and the network determines the direction indication based on the satellite position, the satellite movement direction and the terminal position;

[0021] When the satellite approaches the terminal, the direction indication is set to 1; when the satellite moves away from the terminal, the direction indication is set to 0;

[0022] Effective time t=(direction indication+1)×duration time.

[0023] Preferably, the effective time also includes duration, and the duration includes a time unit and a time length, and the network sets the time unit and the time length according to the satellite orbit height and the satellite moving speed;

[0024] When the satellite orbit altitude is low and the satellite movement speed is relatively high, the duration is set short;

[0025] When the satellite orbit altitude is low and the satellite movement speed is relatively medium, the duration is set short;

[0026] When the satellite orbit height is low and the satellite moving speed is relatively low, the duration is set;

[0027] When the satellite orbit altitude is medium and the satellite movement speed is relatively high, the duration is set short;

[0028] When the satellite orbit height is medium and the satellite moving speed is relatively medium, the duration setting is medium;

[0029] When the satellite orbit height is medium and the satellite moving speed is relatively low, the duration is set long;

[0030] When the satellite orbit altitude is high and the satellite movement speed is relatively high, the duration is set;

[0031] When the satellite orbit altitude is high and the satellite movement speed is relatively medium, the duration is set long;

[0032] When the satellite orbit altitude is high and the satellite moving speed is relatively low, the duration is set long.

[0033] Beneficial technical effects brought by the present invention:

[0034] The present invention uses a method for simultaneously allocating uplink resources and downlink resources through RAR, so that a terminal does not need to receive downlink resource allocation again, and directly receives downlink signals through the downlink resources allocated in the RAR, thereby simplifying the resource allocation flow of the random access process between the terminal and the network, shortening the random access process and the completion time of the terminal accessing the network, and at the same time, in resource allocation, adopting resource allocation within the effective time, thereby increasing the flexibility of resource allocation in the RAR. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 A schematic diagram showing the principles for setting up directional indicators. DETAILED DESCRIPTION

[0036] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments:

[0037] RAR includes resource sets such as downlink resource allocation indication, uplink resource allocation and downlink resource allocation, and its structure is shown in Table 1.

[0038] Table 1

[0039]

[0040] The downlink resource allocation indication is used to indicate whether the RAR contains downlink resource allocation.

[0041] Uplink resource allocation includes frequency domain resources, time domain resources, etc.

[0042] Downlink resource allocation includes frequency domain resources, time domain resources, etc.

[0043] The frequency domain resources include frequency / RB indication and frequency domain resource parameters, and the structure is shown in Table 2.

[0044] Table 2

[0045] Frequency / RB indication Frequency domain resource parameters

[0046] The frequency / RB indication is used to indicate whether the frequency domain resource parameter carries a frequency parameter or an RB parameter.

[0047] When the “frequency / RB indication” indicates frequency, the frequency domain resource parameters include frequency band, frequency, sub-frequency, etc., and the structure is shown in Table 3.

[0048] Table 3

[0049] Frequency band frequency frequency

[0050] When the "frequency / RB indication" indicates RB, the frequency domain resource parameters include RB start, RB length, etc., and the structure is shown in Table 4.

[0051] Table 4

[0052] RB Start RB length

[0053] The time domain resources include the subframe allocation quantity / valid time indication and time domain resource parameters, and the structure is shown in Table 5.

[0054] Table 5

[0055]

[0056] The subframe allocation quantity / valid time indication is used to indicate whether the time domain resource parameter carries the subframe allocation quantity or the valid time.

[0057] When the "Subframe allocation quantity / valid time indication" indicates the subframe allocation quantity, the time domain resource parameters include the subframe starting position n, the subframe interval k and the allocation quantity j. Subframe n, subframe n+k, ... subframe n+k*(j-1) are the allocated time domain resources, and the structure is shown in Table 6.

[0058] Table 6

[0059] Subframe start position Subframe interval Allocation Quantity

[0060] When the "Subframe Allocation Number / Valid Time Indication" indicates the valid time, the time domain resource parameters include the subframe starting position n, the subframe interval k and the valid time t, subframe n, subframe n+k, ... subframe is the allocated time domain resource, and the structure is shown in Table 7.

[0061] Table 7

[0062] Subframe start position Subframe interval Validity period

[0063] The effective time includes direction indication and duration, and the structure is shown in Table 8. The network determines the direction indication based on the satellite position, satellite movement direction and terminal position.

[0064] Table 8

[0065] Directions Duration

[0066] When the satellite approaches the terminal, the direction indicator is set to 1; when the satellite moves away from the terminal, the direction indicator is set to 0. The direction indicator setting principle is as follows: Figure 1 As shown in the figure, effective time t = (direction indication + 1) × duration.

[0067] Duration includes time unit and time length, and the structure is shown in Table 9. The network sets the time unit and time length according to the satellite orbit height and satellite moving speed.

[0068] Table 9

[0069] Time Unit Duration

[0070] When the satellite orbit height is low and the satellite moving speed is relatively high, the duration is set short; when the satellite orbit height is low and the satellite moving speed is relatively medium, the duration is set short; when the satellite orbit height is low and the satellite moving speed is relatively low, the duration is set medium; when the satellite orbit height is medium and the satellite moving speed is relatively high, the duration is set short; when the satellite orbit height is medium and the satellite moving speed is relatively medium, the duration is set medium; when the satellite orbit height is medium and the satellite moving speed is relatively low, the duration is set long; when the satellite orbit height is high and the satellite moving speed is relatively high, the duration is set medium; when the satellite orbit height is high and the satellite moving speed is relatively medium, the duration is set long; when the satellite orbit height is high and the satellite moving speed is relatively low, the duration is set long. The duration setting principle is shown in Table 10.

[0071] Table 10

[0072]

[0073] Of course, the above description is not a limitation of the present invention, and the present invention is not limited to the above examples. Changes, modifications, additions or substitutions made by technicians in this technical field within the essential scope of the present invention should also fall within the protection scope of the present invention.

Claims

1. A resource allocation method in a satellite communication random access process, characterized in that: The steps include: Step 1: Provide downlink resource allocation instructions; Indicating, by means of a downlink resource allocation indication, whether the random access response includes downlink resource allocation; Step 2: Perform uplink resource allocation and downlink resource allocation simultaneously through random access response.

2. The resource allocation method in the satellite communication random access process according to claim 1, characterized in that: Both uplink resource allocation and downlink resource allocation include frequency domain resources and time domain resources.

3. The resource allocation method in the random access process of satellite communication according to claim 2, characterized in that: Frequency domain resources include frequency / RB indication; The frequency / RB indication is configured to indicate whether the frequency domain resource parameter carries a frequency parameter or an RB parameter; When "Frequency / RB indication" indicates frequency, the frequency domain resource parameters include frequency band, frequency, and sub-frequency; When the "frequency / RB indication" indicates RB, the frequency domain resource parameters include RB start and RB length.

4. The resource allocation method in the satellite communication random access process according to claim 2, characterized in that: The frequency domain resources also include frequency domain resource parameters; Time domain resources include subframe allocation quantity / valid time indication and time domain resource parameters; The subframe allocation quantity / valid time indication is configured to indicate whether the time domain resource parameter carries the subframe allocation quantity or the valid time; When the "subframe allocation number / valid time indication" indicates the subframe allocation number, the time domain resource parameters include the subframe starting position n, the subframe interval k and the allocation number j, and subframe n, subframe n+k, ... subframe n+k*(j-1) are the allocated time domain resources; When the "subframe allocation number / valid time indication" indicates the valid time, the time domain resource parameters include the subframe starting position n, the subframe interval k and the valid time t, subframe n, subframe n+k, ... subframe is the allocated time domain resource.

5. The resource allocation method in the satellite communication random access process according to claim 4, characterized in that: The validity period includes the direction indication, which is determined by the network based on the satellite position, the direction of satellite movement, and the terminal position; When the satellite approaches the terminal, the direction indication is set to 1; when the satellite moves away from the terminal, the direction indication is set to 0; Effective time t=(direction indication+1)×duration time.

6. The resource allocation method in the random access process of satellite communication according to claim 4, characterized in that: The effective time also includes the duration, which includes the time unit and the time length. The network sets the time unit and the time length according to the satellite orbit height and the satellite moving speed. When the satellite orbit altitude is low and the satellite movement speed is relatively high, the duration is set short; When the satellite orbit altitude is low and the satellite movement speed is relatively medium, the duration is set short; When the satellite orbit height is low and the satellite moving speed is relatively low, the duration is set; When the satellite orbit altitude is medium and the satellite movement speed is relatively high, the duration is set short; When the satellite orbit height is medium and the satellite moving speed is relatively medium, the duration setting is medium; When the satellite orbit height is medium and the satellite moving speed is relatively low, the duration is set long; When the satellite orbit altitude is high and the satellite movement speed is relatively high, the duration is set; When the satellite orbit altitude is high and the satellite movement speed is relatively medium, the duration is set long; When the satellite orbit altitude is high and the satellite moving speed is relatively low, the duration is set long.

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