Access technology of 5G New Radio in NSA mode

Abstract

The present invention relates to the access technology of 5G new radio in NSA mode. It includes an access method: access and reside in a long-term evolution (LTE) cell, and then start to detect a 5G new radio NR cell. When an NR signal that meets the S access criterion is detected, the access NR cell is added. When the detected NR cell does not meet the S access criterion, the LTE resource occupancy load is first determined. While keeping the LTE cell access unaffected, the load occupied by the LTE resources is released until the NR meets the S access criterion, and then the access NR cell is added. It also involves a communication module, a user device and a storage medium that carry the operation of the method. The above scheme can improve the access success rate of NR and improve the user's network experience.

Description

Technical Field

[0001] The present invention relates to an access technology of 5G New Radio (NR) in an NSA networking mode in the field of wireless communication technology, and in particular to an access method, a communication module, a user equipment and a storage medium. Background Art

[0002] In the 5G NSA (Non-Stand Alone) networking mode, most operators currently use the NSA3X networking mode. In this networking mode, Long Term Evolution (LTE) exists in the form of a primary carrier and is controlled using the control plane, while 5G New Radio (NR) only exists as an auxiliary identity of the secondary carrier user plane. In this mode, NR access begins only after LTE access is successful, and its access success rate is greatly affected by the LTE network. In the NSA mode, although platform chip manufacturers have implemented DPS technology, namely dynamic power sharing (DPS), allowing LTE and NR to share limited transmission power to improve coverage and enhance spectrum efficiency, existing technologies have given LTE a higher priority. When dealing with resource conflicts between LTE and NR, priority is given to ensuring the use of LTE resources, while ignoring the resource allocation of NR. The problem it brings is that when both LTE and NR exist, consumers cannot give priority to using NR signals with better performance. Summary of the invention

[0003] In view of this, the main purpose of the present invention is to provide a method, communication module, user equipment and storage medium for improving the access success rate of 5G New Radio (NR: New Radio) in NSA networking mode.

[0004] In order to achieve the above-mentioned purpose, an embodiment of the present invention discloses a 5G New Radio (NR) access method, including: accessing and always staying in a long-term evolution (LTE) cell, and then starting to detect the NR cell. When a NR that meets the access S access criteria is detected, the NR cell is added for access. The method is executed by LTE with a control instruction of the main carrier control plane, and the NR is accessed as an auxiliary carrier user plane. When a NR that does not meet the S access criteria is detected, the load occupied by the LTE resources is determined, and the load occupied by the LTE resources is released until the NR meets the S access criteria, and then the NR cell is added for access.

[0005] In one embodiment, the 5G new radio access method includes repeatedly detecting the NR cell after failing to detect the NR.

[0006] In one embodiment, the 5G new radio access method releases the load occupied by LTE resources by downgrading the LTE transmit power based on a preset LTE transmit power level table.

[0007] In one embodiment, the 5G new radio access method releases the load occupied by LTE resources by reducing the LTE transmit power by a preset level based on a preset LTE transmit power level table.

[0008] In one embodiment, the 5G new radio access method includes, when the NR still does not meet the S access criteria after the LTE transmit power is reduced by a preset level, a loop is executed to reduce the level by one level each time and then determine whether the NR meets the S access criteria until the access NR cell is added.

[0009] In one embodiment, the 5G new radio access method includes reducing the resource block configuration of the LTE physical uplink shared channel (PUSHC) when releasing the load occupied by LTE resources based on the FDD / TDD frequency band.

[0010] In one embodiment, the 5G new radio access method includes adjusting the LTE uplink and downlink subframes (time slots) based on the TDD frequency band when releasing the load occupied by LTE resources.

[0011] The embodiment of the present invention further provides a wireless network communication module (NAD), which can execute the method:

[0012] Access and keep the user equipment (UE) resident in the LTE cell, and then start to detect the NR cell. When the NR signal that meets the S access criteria is detected, add access to the NR cell. The method is executed by LTE with the control instruction of the main carrier control plane, and NR accesses as the auxiliary carrier user plane. When an NR that does not meet the S access criteria is detected, the load occupied by LTE resources is determined, and the load occupied by LTE resources is released until the NR meets the S access criteria, and then add access to the NR cell.

[0013] Wherein, the wireless network communication module NAD is integrated in the vehicle TCU.

[0014] The embodiment of the present invention also provides a user equipment (UE), including a storage module, at least one processor, and a response module. The UE can access and always remain in the LTE cell, and then start to detect the NR cell. When the NR signal that meets the S access criteria is detected, the NR cell is accessed. The method is executed by the LTE with the control instruction of the main carrier control plane, and the NR is accessed as the auxiliary carrier user plane. When the NR that does not meet the S access criteria is detected, the load occupied by the LTE resources is determined, and the load occupied by the LTE resources is released until the NR meets the S access criteria, and then the access to the NR cell is added.

[0015] And an embodiment of the present invention further provides an electronically readable storage medium storing a software program, which enables the processor to execute the access method disclosed in the present invention when the processor calls the program.

[0016] The beneficial effects of the present invention are:

[0017] The method, communication module, user equipment and storage medium provided by the present invention can greatly improve the access success rate of 5G new radio NR, avoid failures and invalid network bearer caused by multiple invalid access attempts, and take into account the user's use of NR while ensuring the existing LTE access priority, thereby improving the user's network experience and achieving efficient use of different types of networks without additional hardware costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a power distribution test data diagram of LTE and NR in different scenarios under the existing DPS (dynamic shared power) technology;

[0019] Figure 2 is Figure 1 The access success rate statistics of NR under condition A shown in the figure;

[0020] Figure 3 is Figure 1 The access success rate statistics of NR under condition C are shown;

[0021] Figure 4 It is a schematic diagram of an embodiment of the UE provided by the present invention as a carrier for running the method;

[0022] Figure 5 It is a schematic diagram of an embodiment 1 of releasing LTE resource occupation load provided by the present invention;

[0023] Figure 6 This is a schematic diagram of the LTE transmission power level provided by the present invention;

[0024] Figure 7 It is a schematic diagram of a second embodiment of releasing LTE resource occupation load provided by the present invention;

[0025] Figure 8 It is a schematic diagram of resource blocks of a LTE physical uplink channel within a subframe;

[0026] Fig. 9 It is a schematic diagram of Embodiment 3 of releasing LTE resource occupation load provided by the present invention;

[0027] Fig.10 This is a schematic diagram of the subframe (time slot) ratio of LTE uplink and downlink;

[0028] Fig.11 is a schematic diagram of UE hardware provided by the present invention; DETAILED DESCRIPTION

[0029] In the following description, many specific details are set forth so that those skilled in the art will have a more comprehensive understanding of the present invention. It should be understood that the present invention is not limited to the specific embodiments described. On the contrary, any combination of the following features and elements may be considered to implement the present invention, regardless of whether they relate to different embodiments. Therefore, the following aspects, features, embodiments, and advantages are intended for illustration only and should not be considered as elements or limitations of the claims unless expressly set forth in the claims.

[0030] Figure 1 What is revealed is the power distribution test data diagram of LTE and NR in different scenarios under the existing DPS (dynamic shared power) technology.

[0031] Under the current technical background, in the NSA mode, platform chip manufacturers have implemented DPS technology, namely dynamic power sharing (DPS), allowing LTE and NR to share limited transmission power to improve coverage and enhance spectrum efficiency. Figure 1 The test data of each scenario in the test reflects the following characteristics of DPS technology:

[0032] 1. LTE and NR will share existing power;

[0033] 2. The sum of the power measured by LTE and NR is less than or equal to 23dBm, which is the limit given by power class 3 (for power class 2, the sum of the power of LTE and NR is less than or equal to 26dbm; for power class 1.5, the sum of the power of LTE and NR is less than or equal to 29dbm);

[0034] 3. Comparing the power allocation strategies, LTE enjoys a higher priority than NR, that is, under the same competition conditions, more power is allocated to LTE.

[0035] This brings up a problem. In different situations, such as Figure 1 Given the conditions A / B / C in the above, what is the performance of the NR access rate and the resulting release rate over a long period of time and multiple times? In this regard, the following two sets of data were statistically analyzed to further verify this issue (test environment: R&S CMX500 5G platform test system; device under test: Qualcomm SA515 platform NAD project), see Figure 2 and Figure 3 .

[0036] Depend on Figure 2 and Figure 3 It can be seen that the NR access success rate is 100% under condition A, and the access success rate drops to 78% under condition C. This shows that when LTE occupies most of the limited power, the NR addition / access success rate will drop significantly. Figure 1 It can be seen that under condition C, the LTE output power is 23dbm, and the NR output power is only -30dbm. When the total power is constant, LTE occupies most of the power)

[0037] Figure 4 It is a schematic diagram of an embodiment provided by the present invention in which a user equipment UE is used as a carrier for running the method of the present invention.

[0038] In short, if the UE (user equipment, including the vehicle-mounted NAD module) detects the NR signal, if there is an NR that does not meet the S access criteria, without affecting the LTE access, it will try to prioritize the implementation of measures to reduce the LTE resource occupation load, so as to reduce the LTE occupied power ratio, release a part to the NR, and then continue to try to add access to the NR cell. The measures that can be taken include actively reducing the LTE uplink service demand, such as reducing the UE transmit power through the power control system, adjusting the uplink resource block configuration, reconfiguring the uplink and downlink ratio, etc., so as to supply NR with more power to improve the access success rate. Specifically, step S410 discloses a user equipment UE including a wireless communication module for accessing the network, which first needs to access and reside in the LTE cell. Because the focus of the present invention is to solve the NR access problem, how the UE first accesses the LTE cell and resides is not described in detail. After the UE successfully accesses and resides in the LTE cell, the UE will continue to detect the signal strength of the nearby NR cell in step S420. As for the current development of communication networks, in the early stage of 5G NR deployment, operators mainly focus on the use of sub 6GHz, and this range of frequencies was widely allocated to LTE systems for use in the early stage. It is difficult to directly meet the needs of 5G NR single-cell carriers for continuous 100MHz frequencies. Although operators may achieve this demand through gradual large-scale frequency shift strategies, with the gradual increase in potential 5G users, the frequency coexistence problem of LTE and NR systems needs to be analyzed and planned in advance. On the other hand, since the carrier frequency of 5G is generally allocated to a higher frequency band, there may often be scenarios with limited uplink coverage during the actual network operation and maintenance process. One solution is to enhance uplink coverage by reusing a lower frequency. This scenario is called uplink supplementary transmission (SUL). In this scenario, NR is likely to reuse the frequency of LTE, which is also a typical scenario of coexistence of LTE and NR system frequencies. As mentioned above, the present invention actually discusses the NR access problem in the scenario of LTE and NR coexistence. In step S430, if the UE detects the NR signal, the first thing to do is to determine whether the NR signal meets the S access criterion of the camping cell. The S access criterion is a well-known criterion, which needs to meet the following conditions:

[0039] Srx l ev>0AND Squa l>0; where: Squa l=Qqua l meas–Qqua lmin; Srx l ev=Qrx l evmeas-Qrx l evmin–Pcompensat i on; in the conditions of the S access criterion, Qqua lmeas is the measured value of the cell quality Ec / N0 of CPI CH, Qrx l evmeas is the RSCP of CPI CH, Qrx l evmin is the minimum pilot signal received power required by the current cell, Pcompensat i on=max(UE_TXPWR_MAX_RACH–P_MAX,0), UE_TXPWR_MAX_RACH is the maximum uplink transmit power allowed for UE when accessing the cell, that is, MaxAl l owedULTxPower, and P_MAX is the maximum RF output power of the UE.

[0040] In short, if the UE wants to obtain network services, it needs to confirm whether the current cell is suitable for staying based on the cell system information and terminal attributes. The cell level and signal quality are one of the evaluation criteria.

[0041] In step S440, if the UE detects the NR signal, the NR does not meet the S access criteria at this time, but considering the advantages of the NR signal, the UE will first determine the resource occupancy load of the currently resident LTE, including the LTE transmit power, the resource block configuration of the LTE uplink shared channel, or one or more of the LTE uplink and downlink time slots. After clarifying the LTE resource occupancy, in order to access the NR and improve the NR access rate, the UE will execute the content disclosed in step S450, release part of the LTE resource occupancy, so that the NR can meet the S access criteria, and then the UE can successfully access the NR cell. However, while releasing the LTE resource occupancy, it does not give up the residence in the LTE cell, but releases the LTE resource occupancy within a certain range, so that the UE can both access the NR cell and continue to reside in the LTE cell. At this time, the dual residence of the UE in the LTE and NR cells is realized. The present invention maximizes the access success rate of the NR by releasing the LTE resource occupancy in a limited and controllable manner. Under the same circumstances, the processing of the prior art is that even if the high resource occupancy of LTE is not very reasonable, LTE is still prioritized, making NR access very difficult. Step S460 reveals that after the UE is processed in the above steps, it maintains dual residency in the LTE / NR cell. Of course, between steps S430 and S440, if the NR detected by the UE at the beginning meets the S access criteria, in this case it is obvious that the UE directly accesses the NR cell without the need for subsequent processing.

[0042] Figure 5 The present invention discloses one embodiment of releasing LTE resource occupation, that is, processing the LTE transmission power. The processing method mainly includes, as disclosed in step S510, firstly, a LTE transmission power level table needs to be pre-set. Figure 6 A specific example of a power level table is given in FIG. 1. For the logic of reducing LTE transmission power to release LTE resource occupation, the LTE transmission power is adjusted / reduced by one level according to the predetermined power level table. That is, according to Figure 6 In the example, if the current LTE transmission power is 20dbm, the adjustment at this time is to lower the current 20dbm by one level, so Figure 5 Step S530, reference Figure 6 The preset level table shows that the next level of LTE transmission power is 20dbm-3db=17dbm, where 3db is the preset step value. That is, the level table of transmission power is set according to each level being reduced by 3db relative to the previous level. Therefore, if the level is reduced by one level, that is, the LTE transmission power is lowered by 3db, the detected NR still does not meet the S access criteria, such as Figure 5 Step S540 discloses that the operation of continuing to reduce the level by one level can be performed until the situation that LTE is still resident and NR meets the S access criteria occurs. Of course, for the set step value of 3db, a setting of 2db or 4db can also be adopted, and the present invention is not limited to 3db.

[0043] Figure 7 What is revealed is the second way to deal with releasing LTE resource occupancy, which is to reduce the resource block (RB) configuration of the LTE physical uplink shared channel (PUSHC). The LTE physical uplink shared channel carries the transmission of uplink data and is an important part of uplink energy consumption. Under certain conditions, if the output of this part of energy can be reduced by adjusting the configuration of the uplink shared channel resource block (RB), it will have a certain regulatory effect on the size of the overall UE transmission power. That is, reducing the physical uplink shared channel resource block configuration can release LTE resource occupancy.

[0044] The instructions are as follows Figure 8As shown, the X-axis represents time and the Y-axis represents the LTE physical uplink channel bandwidth. Within 1 subframe (1subframe=0.5ms), the overall energy loss of LTE can be reduced by reducing the configuration of the LTE physical uplink channel resource blocks. If the total amount of resource blocks occupied by the physical uplink shared channel is Nrbx, the best implementation is to adjust the number of resource blocks occupied in descending order of occupancy value to the original Nrbx / 2, Nrbx / 3, Nrbx / 4... (function rounding=round(Nrbx / 2, Nrbx / 3, Nrbx / 4...)). However, the adjustment method is not limited to this, because from the means disclosed in the present invention, in principle, the subsequent adjustment is effective as long as the total amount of resource blocks occupied by the adjusted uplink shared channel is lower than the total amount of resource blocks currently occupied.

[0045] If the LTE network is in good condition, in order not to affect the LTE service flow, the uplink throughput can be improved by adjusting the uplink modulation scheme (MCS, modulation and coding scheme) while reducing the configuration of LTE resource blocks. Taking the bandwidth of 20MHz as an example, MCS=2(QPSK), the rate is 21.7Mb / s, MCS=4(16QAM), the rate is 43.3Mb / s, and MCS=7(64QAM), the rate is 72.2Mb / s.

[0046] At the same time, when the modulation method is adjusted, according to the 3GPP strategy, the LTE uplink power is also backed off by a certain percentage. In this way, the LTE power is reduced without affecting the LTE uplink traffic. That is, the power allocated to NR contributes to the quota, and its access rate will also be improved.

[0047] Modulation Maximum Power Reduction (MPR, db) QPSK ≤1db 16QAM ≤2db 64QAM ≤3db

[0048] Therefore, the adjustment of the modulation mode can be carried out together with the adjustment of reducing the LTE uplink resource blocks and optimized to obtain a comprehensive adjustment plan, and there are many possible combinations. As long as the final effect of the adjustment can be achieved: without affecting LTE residence, the LTE power can be reduced, and more power can be provided to NR, it can be considered an effective adjustment. For example, the number of resource blocks occupied is adjusted to the original Nrbx / 2, and the modulation mode is adjusted to 16QAM. Alternatively, the number of resource blocks occupied can also be adjusted to the original Nrbx / 2, but the modulation mode is adjusted to 64QAM. Of course, the optimal adjustment embodiment of the modulation mode as a supplementary adjustment is to adjust it in descending order of the maximum power backoff value.

[0049] Fig. 9What is revealed is a specific adjustment scheme for the third method of releasing LTE resource occupancy, that is, adjusting the LTE uplink and downlink subframes (time slots). For the TDD standard, the uplink and downlink configuration is relatively flexible, and 7 configuration methods are given by default. Fig.10 An example is given. Each ratio has a different load on the uplink bearer. The purpose of the present invention is to reduce the weight of the uplink ratio, so the case with the lightest uplink ratio can be selected, such as configuration 5, with only one uplink subframe. It is also possible to flexibly adjust the uplink and downlink configurations by customizing them. If the current LTE uplink and downlink configuration calls the DL / UP 2:3 configuration, and the NR access does not meet the S access criteria at this time, the LTE up / down configuration can be adjusted to the DL / UP 3:2 configuration, that is, to reduce the time occupied by the uplink ratio and reduce the load on the uplink bearer. The aforementioned DL is downlink, and UP is uplink. For the given ratio method, the best embodiment is to directly adjust to the configuration with the lightest uplink ratio, that is, configuration 5. Of course, it is also possible to start from the current configuration and adopt a configuration in which the uplink ratio value is gradually reduced in sequence. For example, if the current DL / UP is a 2:3 configuration, the first step of the adjustment is configuration 6, DL / UP 5:5 configuration, and then configuration 2, DL / UP 3:2 configuration. However, the adjustment method is not limited thereto, because from the means disclosed in the present invention, in principle, the subsequent adjustment is effective as long as the uplink ratio value is lower than the current uplink ratio value.

[0050] like Fig.11 As shown in the figure, it shows a schematic diagram of UE hardware. The storage module is used to store some preset control information. The application processor will detect the information fed back by the front end and send control information to the front end. The modem is a response module that can reduce the power output of the transceiver. The RF front-end module is also a response module that can reduce the power output activity of the power amplifier.

[0051] Although the present invention has been disclosed as above with preferred embodiments, the present invention is not limited thereto. Any changes and modifications made by any person skilled in the art without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention, and therefore the protection scope of the present invention should be subject to the scope defined by the claims.

Claims

1. A method for accessing 5G new radio NR, the method comprising the following steps: Access and always stay in the Long Term Evolution (LTE) cell; Then, the NR cell is detected. When an NR cell that meets the S access criteria is detected, the NR cell is added and accessed. The method is executed by LTE with the control instruction of the primary carrier control plane, and NR accesses as the auxiliary carrier user plane. When the detected NR cell does not meet the S access criteria, the LTE resource occupancy load is first determined; Then, the LTE resource occupancy load is released until the NR meets the S access criteria, and then access to the NR cell is added.

2. The method of claim 1, wherein: After detecting that NR does not meet the S access criteria, repeatedly detect whether NR meets the S access criteria.

3. The method of claim 1, wherein: The releasing of the LTE resource occupation load is to downgrade the LTE transmission power based on a preset LTE transmission power level table.

4. The method of claim 3, wherein: Releasing the LTE resource occupation load is achieved by reducing the LTE transmission power by a preset level based on a preset LTE transmission power level table.

5. The method of claim 4, wherein: When NR still does not meet the S access criteria after reducing the LTE transmission power by a preset level, the method of reducing the level by one level each time and then judging whether NR meets the S access criteria is executed in a loop until the NR cell is added for access.

6. The method of claim 1, wherein: The release of LTE resource occupation load is achieved by reducing the resource block (RB, resource block) configuration of the LTE physical uplink shared channel (PUSHC) under the FDD / TDD frequency band.

7. The method of claim 1, wherein: The release of LTE resource occupation load is achieved by adjusting LTE uplink and downlink subframes (time slots) in the TDD frequency band.

8. A wireless network communication module (NAD), wherein: The communication module is able to perform methods: Access the network and keep the user equipment (UE) resident in the Long Term Evolution (LTE) cell at all times; Then start detecting 5G new radio NR cells. When a NR cell that meets the S access criteria is detected, add the access NR cell. The method is executed by LTE with a control instruction of the primary carrier control plane, and NR accesses as an auxiliary carrier user plane. When the detected NR cell does not meet the S access criteria, the load of LTE resources is first determined; Release the load occupied by LTE resources until NR meets the S access criteria, and then add access to the NR cell.

9. The wireless network communication module according to claim 8, wherein: The wireless network communication module (NAD) is integrated in the vehicle TCU.

10. A user equipment UE, wherein: include: A storage module, used for storing control instructions; at least one processor configured to execute control instructions to perform the method; A response module, configured to execute a control instruction sent by the processor; The methods to be executed include: Access and keep the UE camped on the Long Term Evolution LTE cell; Then, the detection of 5G new radio NR cells begins. When an NR that meets the S access criteria is detected, the access NR cell is added. The method is executed by LTE with a control instruction of the primary carrier control plane, and NR accesses as an auxiliary carrier user plane. When an NR that does not meet the S access criteria is detected, the load occupied by the LTE resources is determined; Release the load occupied by LTE resources until NR meets the S access criteria, and then add access to the NR cell.

11. An electronically readable storage medium, characterized in that: The electronically readable storage medium stores a software program, and when a processor calls the program, the processor is caused to execute the method according to any one of claims 1 to 7.

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