A 5GNR access and backhaul integrated waveform design method

Abstract

The present invention discloses a 5GNR access and backhaul integrated waveform design method, which relates to the field of wireless communications, including: selecting TDM as the access and backhaul multiplexing mode, and defining the TDM time slot length as 2.5ms, and the TDM multiplexing period as 20ms; the present invention can use different bandwidths for access and backhaul time slots in the bandwidth decoupling stage. At the same time, in the waveform decoupling stage, the waveform parameters in the access and backhaul time slots, such as SCS and subframe ratios, can be different to achieve different coverage scenarios; and resource allocation is simple, 20ms is used as the TDM period, and the 3GPP protocol requires that the first Symmol every 20ms be allocated to the access network, and the PBCH transmission period is also 20ms.

Description

Technical Field

[0001] The present invention relates to the field of wireless communications, and in particular to a 5GNR access and backhaul integrated waveform design method. Background Art

[0002] The statements in this section merely provide background information related to the present disclosure and may not constitute prior art.

[0003] The 5G network system is mainly composed of network elements such as terminals, base stations and core networks. Among them: the Uu interface on the base station and terminal side mainly carries the wireless access function of the terminal, which is called the access network RAN (Radio Access Network); the NG interface on the core network side mainly carries functions such as control plane and user plane data management, which is called backhaul BH (Backhaul).

[0004] In some special application scenarios, base stations and core networks are deployed in an integrated manner, and the interconnection between core networks is called horizontal connection. For backhaul or horizontal connection networks, traditional technologies use wired connections. However, in some special application scenarios, such as mobile scenarios, where base stations move with the platform, wired connections cannot meet application requirements. Therefore, in such scenarios, backhaul or horizontal connection usually adopts a separate wireless transmission method, such as wireless ad hoc network.

[0005] When multiple spectrum segments exist, access networks and ad hoc networks each use their own frequency bands, multiplexing them using FDM (Frequency-Divison Multiplex). However, in some special scenarios, the access network and ad hoc networks need to share a spectrum segment. There are two methods for using wireless resources: FDM (Frequency-Divison Multiplex) and TDM (Time-Divison Multiplex). The decision on which method to use is a key issue, primarily considering the following two factors: spectrum utilization (maximizing spectrum utilization efficiency); and flexibility and implementation complexity (balancing flexibility and system implementation complexity). Summary of the Invention

[0006] The purpose of the present invention is to provide a 5GNR access backhaul integrated waveform design method to solve the problems existing in the prior art.

[0007] The technical solutions of the present invention are as follows:

[0008] A 5G NR access and backhaul integrated waveform design method, comprising:

[0009] Step S1: Select access backhaul multiplexing mode;

[0010] Step S2: Based on the selected access backhaul multiplexing mode, define the cycle;

[0011] Step S3: Design the fusion waveform.

[0012] Furthermore, the step S1 includes:

[0013] TDM is selected as the access and return multiplexing method.

[0014] Furthermore, the step S2 includes:

[0015] Step S21: defining the TDM time slot cycle;

[0016] Step S22: Define the TDM multiplexing period.

[0017] Furthermore, the step S21 includes:

[0018] Access and return TDM multiplexing timeslot length, the value is 5, the unit is "Slot".

[0019] Furthermore, the step S21 further includes:

[0020] When the subcarrier spacing is 30 kHz, the multiplexing time slot length is 2.5 ms.

[0021] Furthermore, the step S22 includes:

[0022] The access and backhaul TDM multiplexing period is defined as 20ms.

[0023] Furthermore, the step S3 includes:

[0024] When the subcarrier spacing is 30 kHz, the access and backhaul converged waveform design is as follows:

[0025] The length of a multiplexing time slot is 2.5ms. A TDM cycle contains 8 multiplexing time slots, which are abbreviated as follows according to the letters:

[0026] A represents the access time slot, and B represents the return time slot;

[0027] TDM Patern0: The access-backhaul ratio is 1:1, the time slot pattern is ABABABAB, and the multiplexing period is 20ms.

[0028] TDM Patern1: The access-backhaul ratio is 2:2, the time slot pattern is AABBAABB, and the multiplexing period is 20ms.

[0029] TDM Patern2: The access-backhaul ratio is 3:1, the time slot pattern is AAABAAAB, and the multiplexing period is 20ms.

[0030] TDM Patern3: The access-backhaul ratio is 1:3, the time slot pattern is ABBBABBB, and the multiplexing period is 20ms.

[0031] TDM Patern4: The access-backhaul ratio is 4:4, the time slot pattern is AAAABBBB, and the multiplexing period is 20ms.

[0032] TDM Pattern 5: The access-backhaul ratio is 7:1, the time slot pattern is AAAAAAAB, and the multiplexing period is 20ms.

[0033] TDM Patern6: The access-backhaul ratio is 6:2, the time slot pattern is AAAAAABB, and the multiplexing period is 20ms.

[0034] TDM Patern7: The access-backhaul ratio is 5:3, the time slot pattern is AAAAABBB, and the multiplexing period is 20ms.

[0035] TDM Patern8: The access-backhaul ratio is 1:7, the time slot pattern is ABBBBBBB, and the multiplexing period is 20ms.

[0036] TDM Patern9: The access-backhaul ratio is 2:6, the time slot pattern is AABBBBBB, and the multiplexing period is 20ms.

[0037] TDM Patern10: The access-backhaul ratio is 3:5, the time slot pattern is AAABBBBB, and the multiplexing period is 20 ms.

[0038] Furthermore, the TDM Patern1, TDM Patern4, TDM Patern6, and TDM Patern9 also support access-backhaul ratios of 8:2 and 7:3.

[0039] Compared with the existing technology, the beneficial effects of the present invention are:

[0040] A 5GNR access and backhaul integrated waveform design method selects TDM as the access and backhaul multiplexing mode, defines the TDM timeslot length as 2.5ms, and the TDM multiplexing period as 20ms. During the bandwidth decoupling phase, the access and backhaul timeslots can use different bandwidths. Furthermore, during the waveform decoupling phase, the waveform parameters within the access and backhaul timeslots, such as SCS and subframe ratios, can be different to achieve different coverage scenarios. Furthermore, resource allocation is simple, with a TDM period of 20ms. The 3GPP protocol requires that the first Symmol be allocated to the access network every 20ms, and the PBCH transmission period is also 20ms. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 This is a flow chart of a 5G NR access and backhaul integrated waveform design method;

[0042] Figure 2 This is a schematic diagram of access and backhaul frequency division multiplexing;

[0043] Figure 3 This is a schematic diagram of time division multiplexing for access and backhaul;

[0044] Figure 4 This is an example diagram of a TDM timeslot cycle. DETAILED DESCRIPTION

[0045] It should be noted that relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article, or apparatus comprising the element.

[0046] The features and performance of the present invention are further described in detail below with reference to the embodiments.

[0047] Example 1

[0048] See also Figure 1 A 5G NR access and backhaul integrated waveform design method includes the following steps:

[0049] Step S1: Select access backhaul multiplexing mode;

[0050] Step S2: Based on the selected access backhaul multiplexing mode, define the cycle;

[0051] Step S3: Design the fusion waveform.

[0052] In this embodiment, specifically, step S1 includes:

[0053] TDM is selected as the access and return multiplexing method. It should be noted that the reasons for selecting TDM as the access and return multiplexing method are as follows:

[0054] 1. Resource utilization

[0055] See also Figure 2,For FDM, in order to prevent interference between the two ,networks, a guard band needs to be left between the two frequency bands. ,Based on the general filter suppression capability evaluation, assuming ,the total bandwidth is 100 MHz, the guard band needs to be 10 MHz, and the spectrum ,utilization rate is 90%.

[0056] See also Figure 3 For TDM, a guard time slot needs to be reserved between time slot switching. The guard time slot depends on the coverage distance. Assume that the coverage distance is 30km and the subcarrier spacing is 30kHz, that is, SCS = "30kHz"; the guard time slot is 5 symbols; taking a 2.5ms 1:1 cycle as an example, the resource utilization rate is 97%.

[0057] Therefore, TDM has higher resource utilization.

[0058] 2. Product implementation complexity

[0059] In TDM multiplexing mode, two networks can share the radio frequency channel and use different time slots through TDM switch.

[0060] FDM requires independent RF channels because it uses different frequency bands.

[0061] 3. Anti-interference ability

[0062] In complex interference scenarios, sudden frequency interference is randomly distributed within the frequency band. An integrated wide frequency band is more conducive to avoiding interference and obtaining anti-interference frequency selectivity benefits; therefore, TDM has more advantages.

[0063] In this embodiment, specifically, step S2 includes:

[0064] Step S21: defining the TDM time slot cycle;

[0065] Step S22: Define the TDM multiplexing period.

[0066] In this embodiment, specifically, step S21 includes:

[0067] The length of the access and return TDM multiplexing time slot is 5 and the unit is "Slot";

[0068] The step S21 further includes:

[0069] When the SCS is 30KHz, the multiplexing time slot length is 2.5ms. It should be noted that the definition of frame length for 5G NR is: a system frame length is 10ms, a subframe is 1ms, and a slot is 0.5ms (subcarrier spacing is 30Khz), so a system frame has 20 slots; the minimum TDD time slot of 5G NR is Slot, which is divided into single cycle and double cycle. Figure 4 shown.

[0070] Therefore, the definition is as follows: The length of the access and return TDM multiplexing time slot (unit "Slot") is "5". When SCS = 30KHz, the multiplexing time slot length is 2.5ms.

[0071] The advantages of the above division are as follows:

[0072] 1. Preserve a complete TDD cycle for 5G NR, simplify resource allocation, and maximize the use of 5G resource allocation and uplink and downlink service ratios.

[0073] 2. The "5" slot division takes into account both latency and resource allocation complexity, achieving a reasonable compromise.

[0074] In this embodiment, specifically, step S22 includes:

[0075] The access and backhaul TDM multiplexing period is defined as 20ms. It should be noted that the TDM multiplexing period analysis mainly refers to the following factors:

[0076] 1. For the access network, the first Symmol every 20ms must be allocated to the access network;

[0077] 2. The 5G NR PBCH transmission period is 20ms;

[0078] 3. The maximum delay of a single hop in the self-organizing network must not exceed 20ms;

[0079] Therefore, it is simpler to allocate time slot resources using "20ms" as the access backhaul TDM cycle.

[0080] In this embodiment, specifically, step S3 includes:

[0081] When the subcarrier spacing is 30 kHz, the access and backhaul converged waveform design is as follows:

[0082] The length of a multiplexing time slot is 2.5ms. A TDM cycle contains 8 multiplexing time slots, which are abbreviated as follows according to the letters:

[0083] A represents the access timeslot (RAN (Radio Access Network)), and B represents the backhaul timeslot (BH (Backhaul)).

[0084] TDM Patern0: The access-backhaul ratio is 1:1, the time slot pattern is ABABABAB, and the multiplexing period is 20ms.

[0085] TDM Patern1: The access-backhaul ratio is 2:2, the time slot pattern is AABBAABB, and the multiplexing period is 20ms.

[0086] TDM Patern2: The access-backhaul ratio is 3:1, the time slot pattern is AAABAAAB, and the multiplexing period is 20ms.

[0087] TDM Patern3: The access-backhaul ratio is 1:3, the time slot pattern is ABBBABBB, and the multiplexing period is 20ms.

[0088] TDM Patern4: The access-backhaul ratio is 4:4, the time slot pattern is AAAABBBB, and the multiplexing period is 20ms.

[0089] TDM Pattern 5: The access-backhaul ratio is 7:1, the time slot pattern is AAAAAAAB, and the multiplexing period is 20ms.

[0090] TDM Patern6: The access-backhaul ratio is 6:2, the time slot pattern is AAAAAABB, and the multiplexing period is 20ms.

[0091] TDM Patern7: The access-backhaul ratio is 5:3, the time slot pattern is AAAAABBB, and the multiplexing period is 20ms.

[0092] TDM Patern8: The access-backhaul ratio is 1:7, the time slot pattern is ABBBBBBB, and the multiplexing period is 20ms.

[0093] TDM Patern9: The access-backhaul ratio is 2:6, the time slot pattern is AABBBBBB, and the multiplexing period is 20ms.

[0094] TDM Patern10: The access-backhaul ratio is 3:5, the time slot pattern is AAABBBBB, and the multiplexing period is 20 ms.

[0095] In this embodiment, specifically, TDM Patern1, TDM Patern4, TDM Patern6, and TDM Patern9 also support access-backhaul ratios of 8:2 and 7:3.

[0096] That is, when the subcarrier spacing is 30 kHz, the access and backhaul fusion waveform design scheme is shown in Table 1.

[0097] Table 1: Access-backhaul fusion waveform design when the subcarrier spacing is 30 kHz

[0098]

[0099] It should be noted that more methods can be expanded according to the required scenarios, and will not be described in detail in this embodiment.

[0100] The above-described embodiments merely represent specific implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of protection of the present application. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the technical concept of the present application, and all such variations and improvements fall within the scope of protection of the present application.

[0101] This background section is provided to generally present the context of the invention, and the work of the presently named inventors, the work to the extent described in this background section, and aspects of the description in this section that did not constitute prior art at the time of filing are neither explicitly nor implicitly admitted to be prior art to the present invention.

Claims

1. A 5G NR access backhaul integrated waveform design method, characterized in that: include: Step S1: Select access backhaul multiplexing mode; Step S2: Based on the selected access backhaul multiplexing mode, define the cycle; Step S3: designing a fusion waveform; The step S1 comprises: Select TDM as the access and return multiplexing method; The step S2 includes: Step S21: defining the TDM time slot cycle; Step S22: defining the TDM multiplexing period; The step S21 includes: The length of the access and return TDM multiplexing time slot is 5, and the unit is Slot. The step S21 further includes: When the subcarrier spacing is 30KHz, the multiplexing time slot length is 2.5ms; The step S22 includes: The access and backhaul TDM multiplexing period is defined as 20ms.

2. A 5G NR access backhaul integrated waveform design method according to claim 1, characterized in that: The step S3 includes: When the subcarrier spacing is 30 kHz, the access and backhaul converged waveform design is as follows: The length of a multiplexing time slot is 2.5ms. A TDM cycle contains 8 multiplexing time slots, which are abbreviated as follows according to the letters: A represents the access time slot, and B represents the return time slot; TDM Patern0: The access-backhaul ratio is 1:1, the time slot pattern is ABABABAB, and the multiplexing period is 20ms. TDM Patern1: The access-backhaul ratio is 2:2, the time slot pattern is AABBAABB, and the multiplexing period is 20ms. TDM Patern2: The access-backhaul ratio is 3:1, the time slot pattern is AAABAAAB, and the multiplexing period is 20ms. TDM Patern3: The access-backhaul ratio is 1:3, the time slot pattern is ABBBABBB, and the multiplexing period is 20ms. TDM Patern4: The access-backhaul ratio is 4:4, the time slot pattern is AAAABBBB, and the multiplexing period is 20ms. TDM Pattern 5: The access-backhaul ratio is 7:1, the time slot pattern is AAAAAAAB, and the multiplexing period is 20ms. TDM Patern6: The access-backhaul ratio is 6:2, the time slot pattern is AAAAAABB, and the multiplexing period is 20ms. TDM Patern7: The access-backhaul ratio is 5:3, the time slot pattern is AAAAABBB, and the multiplexing period is 20ms. TDM Patern8: The access-backhaul ratio is 1:7, the time slot pattern is ABBBBBBB, and the multiplexing period is 20ms. TDM Patern9: The access-backhaul ratio is 2:6, the time slot pattern is AABBBBBB, and the multiplexing period is 20ms. TDM Patern10: The access-backhaul ratio is 3:5, the time slot pattern is AAABBBBB, and the multiplexing period is 20 ms.

3. A 5G NR access backhaul integrated waveform design method according to claim 2, characterized in that: The TDM Patern1, TDM Patern4, TDM Patern6, and TDM Patern9 also support access and return ratios of 8:2 and 7:3.

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