Access selection method and device

[0024] Example 1

[0025] In this embodiment, a method for operating on access selection is provided, image 3 Is a flowchart of an access selection method according to an embodiment of the present invention, such as image 3 As shown, the process includes the following steps:

[0026] Step S302, the first transmission node receives the configuration information of the parent node or the configuration information of the neighboring cell;

[0027] Optionally, the above-mentioned configuration information includes at least one of the following: cell priority information, cell-level information indicating the number of hops to the integrated access backhaul donor IAB donor, system information, resource configuration information, cell access information, cell Selection information, IAB donor information, IAB information; wherein, the IAB donor includes an IAB base station or an IAB donor distributed unit DU; the IAB donor information or IAB information includes at least one of the following: connection hops, level, path cost, load, Congestion, air interface resource occupancy ratio, bandwidth, idle bandwidth, spectrum efficiency, remaining bandwidth of the IAB Donor wireless link, and throughput information; where the system information includes at least one of the following: main system information block MIB, minimum system information minimum SI , IAB selection threshold, IAB reselection offset, IAB donor identification, cell priority information, cell level information, IAB access control parameters, IAB random access parameters, IAB access barred instructions; where, the IAB access control parameters Including: IAB-specific control parameters based on IAB-specific access identification or access level configuration; the IAB random access parameters include: IAB sending preamble resources, IAB receiving message 2 or message 4 resource information, IAB Random access response window size, random access conflict resolution time; the cell access information includes at least one of the following: cell priority information, cell level information indicating the number of hops to the integrated access backhaul host IAB donor; The cell selection information includes at least one of the following: IAB selection threshold, IAB reselection offset, IAB donor identification; wherein, the IAB Donor identification includes: base station identification gNBID, cell global identification NGCI, physical cell identification PCI, distributed unit identification DU ID; where the IAB selection threshold includes: a cell measurement selection threshold, a beam measurement selection threshold; the resource configuration information includes at least one of the following: resource information for communication between the first transmission node and the terminal, the first transmission node and the first transmission node 2. Resource information communicated by the transmission node, and resource information transmitted by the transmission node.

[0028] Optionally, the aforementioned resource information includes at least one of the following: time resource information, frequency resource information, and space resource information; wherein the time resource information includes at least one of the following: subframe offset and period, symbol offset and period, Slot offset and period; the frequency domain resource information includes at least one of the following: carrier index information, bandwidth part index indication information, resource block index indication information; the spatial resource information includes at least one of the following: beam index indication information, Beam direction indication information.

[0029] Step S304: The first transmission node performs measurement, monitoring, or selects an access parent node according to the configuration information.

[0030] Through the above steps, the first transmission node receives the configuration information of the parent node or the configuration information of the neighboring cell; the first transmission node performs measurement, monitoring or selects the parent node to access according to the configuration information. That is to say, the parent node to access is selected according to the received configuration information, thereby solving the problem that in the current IAB multi-hop network in the related technology, when the UE communicates with the core network through multiple IABs, there is no reasonable IAB selection. The method leads to the problem of large communication delay and overhead, thereby achieving the technical effect of reducing communication delay and overhead.

[0031] Optionally, the foregoing first transmission node includes but is not limited to: IAB, relay, and distributed processing unit DU.

[0032] Optionally, the execution order of step S302 and step S304 can be interchanged, that is, step S304 may be executed first, and then S302 may be executed.

[0033] In an optional implementation manner, the level of the second transmission node is higher than the level of the first transmission node; or, the second transmission node is the parent node of the first transmission node; or, the second transmission node It is the serving cell of the first transmission node.

[0034] Optionally, receiving the configuration information of the neighboring cell by the first transmission node includes the following steps:

[0035] Step S11, the first transmission node receives the system information of the neighboring cell sent by the second transmission node through a radio resource control (Radio Resource Control, RRC for short) dedicated message.

[0036] Optionally, before the second transmission node sends the system information of the neighboring cell through RRC proprietary information, the above method further includes the following steps:

[0037] Step S21: The second transmission node receives the system information reported by the third transmission node.

[0038] In an optional implementation manner, receiving the system information reported by the third transmission node by the second transmission node includes the following steps:

[0039] Step S31: The second transmission node receives the system information reported by the third transmission node through RRC dedicated signaling, where the RRC dedicated signaling includes at least one of the following: uplink dedicated control message, connection establishment request information, user Equipment UE auxiliary information, relay auxiliary information, IAB auxiliary information, and uplink transmission information.

[0040] Optionally, the system information reported by the third transmission node includes system information of the cell of the third transmission node or system information of a cell adjacent to the third transmission node.

[0041] Optionally, the monitoring by the first transmission node according to the configuration information includes the following steps:

[0042] Step S41: The first transmission node monitors the system information of the neighboring cell on the resource according to the resource information.

[0043] In an optional implementation manner, the measurement performed by the first transmission node according to the configuration information includes the following steps:

[0044] Step S51: If the signal measurement result of the current cell of the first transmission node is higher than the preset threshold, the first transmission node does not perform measurement on the cell whose cell priority or cell level is lower than the current cell; if the first transmission node If the signal measurement result of the current cell is lower than the preset threshold, the first transmission node performs measurement on the cell whose cell priority or cell level is lower than the current cell; or,

[0045] Step S52: The first transmission node performs measurement on a cell whose cell priority or cell level is higher than the current cell.

[0046] Optionally, the aforementioned second transmission node includes one of the following: IAB, IAB donor, relay, base station, centralized processing unit CU, and distributed processing unit DU. The aforementioned third transmission node includes one of the following: IAB, relay, and distributed processing unit DU.

[0047] Optionally, the centralized processing unit CU has the highest level, and the donor base station has the highest level.

[0048] Optionally, the above method further includes: when the first transmission node is an IAB node node, the IAB node sends the obtained cell identifier of the IAB donor to the Access and Mobility Management Function (AMF) via the NG interface. ); or, when an F1 AP connection is established between the IAB node distributed processing unit DU and the IAB donor centralized processing unit CU; or, the IAB node type is indicated in the F1 establishment message; the IAB donor establishes NG- with the AMF C indicates the IAB node type when connected.

[0049] In this embodiment, a method for operating on access selection is provided, Figure 4 Is a flowchart of another access selection method according to an embodiment of the present invention, such as Figure 4 As shown, the process includes the following steps:

[0050] Step S402, the user equipment UE receives cell priority information, cell level information or access backhaul donor IABdonor information;

[0051] Optionally, the above cell priority information includes at least one of the following: cell priority information of the current cell, cell priority information of neighboring cells; the above cell level information includes at least one of the following: cell level information, relative Cell level information of neighboring cells.

[0052] Step S404, the UE performs measurement or cell reselection according to the cell priority information, the cell level information, or the IAB donor information; wherein the IAB donor information includes at least one of the following: connection hops, level, path cost, load/ congestion. Among them, the IAB donor includes an IAB base station IAB donor distributed unit DU.

[0053] Through the above steps, the user equipment UE receives cell priority information, cell level information, or access backhaul donor IAB donor information; the UE performs measurement or cell reselection according to the cell priority information, cell level information, or IAB donor information; wherein , The IAB donor information includes at least one of the following: connection hop count, hierarchy, path cost, load/congestion. Among them, the IAB donor includes an IAB base station IAB donor distributed unit DU. In other words, the UE can perform measurement or cell reselection according to cell priority information, cell level information, or access backhaul donor IAB donor information, thereby solving the problem of related technologies in the current IAB multi-hop network, where the UE passes multiple IABs In the process of communicating with the core network, there is no reasonable IAB selection method, which leads to the problem of large communication delay and overhead, thereby achieving the technical effect of reducing communication delay and overhead.

[0054] Optionally, the execution order of step S402 and step S404 can be interchanged, that is, step S404 may be executed first, and then S402 may be executed.

[0055] In an optional implementation manner, the above-mentioned cell priority information or the above-mentioned cell level information is carried by system information or a radio resource control RRC dedicated message.

[0056] Optionally, if the RRC specific message received by the UE includes the cell priority information or the cell level information, the UE ignores the cell priority information or the cell level information in the system information.

[0057] In an optional implementation manner, the UE performing measurement according to the cell priority information or the cell hierarchy information includes the following steps:

[0058] Step S61: If the signal measurement result of the current cell of the UE is higher than the preset threshold, the UE does not perform measurement on the cell whose cell priority or cell level is lower than the current cell; if the signal measurement result of the current cell of the UE is lower than the foregoing If the preset threshold is set, the UE performs measurement on a cell whose cell priority or cell level is lower than the current cell; or,

[0059] Step S62: The UE performs measurement on a cell whose cell priority or cell level is higher than the current cell.

[0060] Optionally, the UE performing cell reselection according to the cell priority information or the cell level information includes the following steps:

[0061] Step S71: The UE performs cell reselection on a cell with cell priority information or cell level information higher than the current cell.

[0062] The foregoing step S71 can be implemented in the following manner: the UE performing cell reselection includes: the UE searches for the cell with the strongest signal on each frequency point, reads system information, and obtains cell level information, etc. Select the cell with the highest IAB level among all the searched a suitable cells. Alternatively, the UE performing cell reselection includes: the UE searches for the cell with the strongest signal on each frequency point, reads system information, obtains the cell and neighboring cell levels, finds the cell identifier with the highest cell level, performs detection, and selects it If the cell with the strongest signal meets the conditions of a suitable cell, the cell is selected to camp on.

[0063] Hereinafter, this embodiment will be described with examples in combination with alternative embodiments and examples.

[0064] Alternative embodiment 1

[0065] UE cell selection: If you consider the relay scenario, from the perspective of reducing delay, the UE should choose a higher-level relay as much as possible, so that it can use less hops to reach the IAB Donor, then the UE needs to Get the hierarchical information of the cell.

[0066] Example 1

[0067] IAB carries the IAB level identifier in MIB/SIB. If it is an IAB Donor, the level is 0.

[0068] Then the UE can learn the level of the IAB after reading the system information.

[0069] Or, the cell does not include hierarchical information in the MIB/SIB, but includes cell priority information. Generally speaking, the higher the hierarchy, the higher the priority of the cell, but the two are not in a one-to-one correspondence. The cell can be based on its own Level information, current load or capacity, the priority information of each cell is determined by itself or the IAB donor.

[0070] Therefore, the way the UE selects a cell is:

[0071] Step S81: The UE searches for the cell with the strongest signal on each frequency point, reads the SIB information, and obtains IAB level information or cell priority information, PLMN information, etc.

[0072] Step S82, the UE finds a suitable cell that meets the s criterion according to the measurement result;

[0073] In step S83, the UE selects the cell with the highest IAB level or the highest cell priority information among all suitable cells for access.

[0074] Example 2

[0075] In addition to carrying the IAB level or cell priority information identifier in the MIB/SIB, if the IAB receives the level or cell priority information of other surrounding IABs, it can also broadcast it through the system information in the form of a neighboring cell level list, and the UE After receiving the information, it can be saved locally. The advantage of this is that the UE does not need to read the system information of each cell in turn to receive hierarchical information or cell priority information, which reduces the delay of cell selection.

[0076] Therefore, the way the UE selects a cell is:

[0077] Step S91: The UE searches for the cell with the strongest signal on each frequency point, reads the SIB information, and obtains the level or cell priority information of the IAB and neighboring IAB cells;

[0078] In step S92, the cell with the highest IAB level or cell priority information is detected, and the cell with the strongest signal is selected from the cell, and if the condition as a suitable cell is met, the cell is selected to camp on. If it is not met, continue to select a cell with a lower level or cell priority information for detection, and if it meets the conditions as a suitable cell, select this cell to camp on. If it is not satisfied, continue the above process, and so on.