CN110740515B - Synchronization block configuration method and device for access to backhaul integrated network - Google Patents

Abstract

The application discloses a method and a device for configuring a synchronization block accessed to a backhaul integrated network, wherein the method comprises the following steps: integrated IAB node N for each access backhaul _IAB‑i When accessing to an NR IAB network, acquiring time domain position information of a synchronization block used by other IAB nodes in the current NR IAB network; the IAB node N _IAB‑i And according to the time domain position information and the principle of ensuring that at least N available backup backhaul links exist, selecting a time domain position of a synchronization block suitable for the node from a synchronization block time domain position resource pool of the system, and reporting the time domain position to a network side, wherein N is a preset minimum number of backup backhaul links, and is greater than or equal to 1. The invention can ensure that each IAB node in the NR IAB network has an optional backup backhaul link.

Description

Synchronous block configuration method and device for accessing backhaul integrated network

technical field

The present invention relates to mobile communication technology, in particular to a synchronization block configuration method and device for accessing backhaul integrated network

Background technique

The relay is small in size and light in weight, and can be connected to the base station and the core network through wireless backhaul, which makes the network deployment more flexible and easy to choose the site by using the relay, and can reduce the cost caused by the construction of backhaul optical fiber and equipment room. expenses, greatly reducing costs. Therefore, the 78th plenary meeting of 3GPP RAN agreed to set up a research project "Integrated Access and Backhaul (IAB) for new air interface (NR)", and held the first discussion in the 92nd additional meeting of 3GPP RAN1.

Figure 1 is a schematic diagram of a typical NR IAB network. Among them, the IAB node can perform initial access like a terminal, including cell search and random access, and access to another IAB node or host node; but from the perspective of the terminal, the IAB is a base station. The host node is connected to the core network through wired backhaul. The IAB node is connected to the IAB node through the backhaul link, and finally connected to the core network through the host node. In an IAB network, a backhaul link generally refers to a connection between IAB nodes. An access link (access link) refers to a connection between an IAB node and a terminal.

An IAB node needs to monitor the synchronization block of another IAB node for initial access, but also needs to send a synchronization block so that other IAB nodes can also perform the initial access process. Due to the half-duplex limitation of the IAB node, the IAB node cannot simultaneously send and receive sync blocks.

In the millimeter wave scenario, the backhaul link between IAB nodes is easily blocked, and it is necessary to establish a backup backhaul link. In this way, once the current backhaul link is blocked, the IAB node can switch to the backup backhaul link, connect to other IAB nodes through the backup backhaul link, and finally connect to the core network. As shown in Figure 2, if the backhaul link 1 is blocked, the backhaul link 3 can be used as a backup link, so that the data on the IAB node A can first go through the backhaul link 2 to the IAB node C, and then go through the backup link Backhaul link 3 to IAB node B, and finally access link 1 to terminal B. If the IAB node B and the IAB node C are in the state of simultaneously sending or receiving sync blocks, a backup backhaul link cannot be established between the IAB node B and the IAB node C. Therefore, it is necessary to reasonably set the time-frequency position of the synchronization block, so that IAB node B can receive the synchronization block sent from IAB node C when it is in the receiving state, or make IAB node C can receive the synchronization block sent from IAB node B when it is in the receiving state synchronized block.

Contents of the invention

In view of this, the main purpose of the present invention is to provide a synchronization block configuration method and device for accessing a backhaul integrated network, which can ensure that each IAB node in the NR IAB network has an optional backup backhaul link.

In order to achieve the above object, the technical scheme proposed by the present invention is:

A synchronization block configuration method for accessing a backhaul integrated network, comprising:

When each access backhaul integrated IAB node N _IAB-i accesses the NR IAB network, it obtains the time domain position information of the synchronization block used by other IAB nodes in the current NR IAB network;

The IAB node N _IAB-i , according to the time-domain location information, selects from the synchronization block time-domain location resource pool suitable for this node in accordance with the principle of ensuring at least N available backup backhaul links. The time domain position of the synchronization block used, and the time domain position is reported to the network side, N is the preset minimum number of backup backhaul links, and N is greater than or equal to 1.

Preferably, the time domain position information is a combination of three parameters: SSB-PeriodicityServingCell, n-hf and SSB-PositionsInBurst, wherein SSB-PeriodicityServingCell is the transmission period of the synchronization block, and n-hf is the synchronization block in one frame The occupied half-frame time window, SSB-PositionsInBurst is the time-domain transmission position of the sync block within the half-frame time window.

Preferably, selecting the time domain position of the sync block suitable for use by the node from the sync block time domain position resource pool of the system includes:

A sync block time domain position information is selected from the sync block time domain position resource pool of the system, and the sync block time domain position information does not conflict with the sync block time domain position information of at least N+1 other IAB nodes.

A synchronization block configuration device for accessing a backhaul integrated network, comprising:

The information acquisition unit is used for each access backhaul integrated IAB node N _IAB-i to obtain the time domain position information of the synchronization block used by other IAB nodes in the current NR IAB network when accessing the NR IAB network;

The synchronization block setting unit is used to select the time domain location information from the synchronization block time domain location resource pool of the system according to the principle of ensuring that there are at least N available backup backhaul links according to the time domain location information obtained by the IAB node N _IAB-i , select the time-domain position of the synchronization block suitable for this node, and report the time-domain position to the network side, N is the preset minimum number of backup backhaul links, and N is greater than or equal to 1.

Preferably, the time domain position information is a combination of three parameters: SSB-PeriodicityServingCell, n-hf and SSB-PositionsInBurst, wherein SSB-PeriodicityServingCell is the transmission period of the synchronization block, and n-hf is the synchronization block in one frame The occupied half-frame time window, SSB-PositionsInBurst is the time-domain transmission position of the sync block within the half-frame time window.

Preferably, the sync block setting unit is configured to select a sync block time domain position information from the sync block time domain position resource pool of the system, and the sync block time domain position information is related to at least N+1 other IAB nodes The time-domain position information of the sync blocks does not conflict.

To sum up, in the synchronization block configuration method and device for accessing backhaul integrated network proposed by the present invention, when each IAB node successfully accesses the network, it will The location information is to set the time-domain location of the synchronization block used by the IAB node according to the principle of ensuring at least N available backup backhaul links. In this way, by rationally configuring the time domain position of the sync block, it can be ensured that each IAB node in the NR IAB network has an optional backup backhaul link, thereby enhancing the transmission reliability of the NR IAB network.

Description of drawings

FIG. 1 is a schematic diagram of a typical NR IAB network;

FIG. 2 is a schematic diagram of a backup backhaul link;

Fig. 3 is the schematic flow chart of the method of the embodiment of the present invention;

Fig. 4 is a schematic diagram of the device structure of the embodiment of the present invention.

detailed description

In order to make the purpose, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

The core idea of the present invention is: the synchronization blocks on each IAB node have different transmission positions in the time domain, so that each IAB node in the NR IAB network has at least one optional backup backhaul link.

Fig. 3 is a schematic flow diagram of a method according to an embodiment of the present invention. As shown in Fig. 3 , the synchronization block configuration method implemented in this embodiment for accessing and backhauling an integrated network mainly includes:

Step 301 , when each integrated access backhaul (IAB) node N _IAB-i accesses the NR IAB network, obtains the time-domain location information of sync blocks used by other IAB nodes in the current NRIAB network.

In this step, after each IAB node successfully accesses the network through the initial access process, it needs to obtain the time domain position information of the synchronization blocks used by other IAB nodes that have been accessed in the current NRIAB network, so that in subsequent steps, Further based on the time-domain position information, the time-domain position information of the synchronization block suitable for the node is selected, so as to ensure that the node has at least one optional backup backhaul link.

In practical applications, within a half-frame time window, the maximum number of sync blocks to be transmitted is different under different frequency band ranges. For example, when the carrier frequency is below 3GHz, within the half-frame time window, the maximum number of sync block transmissions is 4; when the carrier frequency is in the range of 3GHz to 6GHz, the maximum number of sync block transmissions is 8; when the carrier frequency is 6GHz When it reaches the range of 52.6GHZ, the maximum transmission number of sync blocks is 64. In addition, the transmission cycle of the synchronization block can be set to 5ms, 10ms, 20ms, 40ms, 80ms, 160ms. Therefore, the IAB node can be viewed from three aspects: transmission period (can be set to 5ms, 10ms, 20ms, 40ms, 80ms, 160ms, not limited to this), half-frame time window (first half-frame time window or second half-frame time window) and The time-domain transmission position within the half-frame time window is used to locate the time-domain position of the sync block.

Therefore, preferably, the time-domain position information can be expressed as a combination of three parameters: SSB-PeriodicityServingCell, n-hf and SSB-PositionsInBurst, that is, in the form of (SSB-PeriodicityServingCell, n-hf, SSB-PositionsInBurst) express.

Among them, SSB-PeriodicityServingCell is the transmission period of the synchronization block, n-hf is the half-frame time window occupied by the synchronization block in one frame, and SSB-PositionsInBurst is the time-domain transmission position of the synchronization block within the half-frame time window.

For example, when the carrier frequency is in the range of 3GHz to 6GHz, if the time-domain transmission position of the synchronization block of an IAB node is set to a transmission period of 20ms, the timing of the synchronization block in the first half frame and half-frame time window of a frame The domain transmission position is expressed as 01010101 by bitmap, and it can be expressed as (SSB-PeriodicityServingCell, n-hf, SSB-PositionsInBurst)=(20, 0, 01010101). Wherein, 1 in the bitmap 01010101 indicates that the time corresponding to the time domain transmission position corresponding to the bit is used for sending, and 0 indicates that it is not limited to sending or receiving.

In practical applications, after an IAB node is connected to the network, it can obtain the time-domain position information of the sync blocks used by other IAB nodes that have connected to the NRIAB network from the host node on the network side, or obtain the above-mentioned time-domain position by searching other IAB nodes information.

Step 302, the IAB node N _IAB-i , according to the time domain location information, selects the applicable The time domain position of the sync block used by this node, and report the time domain position to the network side.

Wherein, the N is a preset minimum number of backup backhaul links, and N is greater than or equal to 1. In practical applications, those skilled in the art can set an appropriate value of N according to actual needs.

In this step, it is necessary to determine the time domain position of the synchronization block used by the IAB node N _IAB-i according to the principle of ensuring at least N available backup backhaul links, so that each IAB node connected to the network has a certain number of Available backup backhaul links.

Preferably, the following method can be used to select the time-domain position of the synchronization block suitable for this node from the synchronization block time-domain position resource pool of the system:

A sync block time domain position information is selected from the sync block time domain position resource pool of the system, and the sync block time domain position information does not conflict with the sync block time domain position information of at least N+1 other IAB nodes.

Through the above selection method, the synchronization block time-domain position information used by each IAB node does not conflict with the synchronization block time-domain position information used by a certain number of other IAB nodes. The non-collision here refers to having different transmission positions in the time domain. For example, different transmission periods, or different half-frame time windows in a frame, or different time-domain transmission positions within a half-frame time window, thereby ensuring that each IAB node in the NR IAB network has a certain number of The number of backup backhaul links available for selection. The following uses an example to explain in detail whether two IAB nodes conflict with respect to the synchronization block time domain position information.

For example, when the carrier frequency is below 3GHz, assuming that there are two IAB nodes in the current NR IAB network, and the time domain position information of the sync block is (10, 0, 1000) and (10, 0, 0100) respectively, then The time-domain position information of the synchronization block of the IAB node newly connected to the NR IAB network may be set as (10, 1, 1100). It can be seen that (10, 1, 1100) and (10, 0, 1000) are in different half-frame time windows, so the time-domain position information of the two sync blocks does not conflict. Similarly, (10, 1, 1100) and (10, 0, 0100) are also in different half-frame time windows, therefore, the time-domain position information of these two sync blocks does not conflict. In this way, both the IAB node and the two IAB nodes in the NR IAB network can establish backhaul links. And if the time-domain position information of the synchronization block of the IAB node newly connected to the NR IAB network is set to (10, 0, 0101), then the transmission periods of (10, 0, 0101) and (10, 0, 0100) are the same, And the half-frame time window is the same, and the time corresponding to the time-domain transmission position corresponding to the second bit in the half-frame time window is used for sending, so there is a time-domain transmission position conflict between the two, and (10, 0, 0101) and (10, 0, 1000) in the time domain transmission positions within the half-frame time window do not conflict, therefore, a backhaul link can be established between the two. In this way, when the time domain position information of the synchronization block is set to (10, 0, 0101), only one of the nodes can establish a backhaul link.

Here, after the IAB node N _IAB-i selects the time domain position of the synchronization block used by the node, in order to facilitate the network side to grasp the time domain position information of the synchronization block used by each IAB node that has been accessed in real time, for subsequent access Based on the above method, the IAB node realizes the reasonable setting of the time domain position of the synchronization block, ensuring that each IAB node in the NR IAB network has at least one backup backhaul link number to choose from, and the IAB node N _IAB-i needs to select the The time domain position information of the sync block is reported to the network side.

Figure 4 is a structural diagram of a synchronization block configuration device for accessing the backhaul integrated network corresponding to the above method, as shown in Figure 4, the device includes:

The information acquisition unit is used for each access backhaul integrated IAB node N _IAB-i to obtain the time domain position information of the synchronization block used by other IAB nodes in the current NR IAB network when accessing the NR IAB network;

The synchronization block setting unit is used to select the time domain location information from the synchronization block time domain location resource pool of the system according to the principle of ensuring that there are at least N available backup backhaul links according to the time domain location information obtained by the IAB node N _IAB-i , select the time-domain position of the synchronization block suitable for this node, and report the time-domain position to the network side, N is the minimum number of preset backup backhaul links, and N is greater than or equal to 1.

Preferably, the time domain position information is a combination of three parameters: SSB-PeriodicityServingCell, n-hf and SSB-PositionsInBurst, wherein SSB-PeriodicityServingCell is the transmission period of the synchronization block, and n-hf is the synchronization block in one frame The occupied half-frame time window, SSB-PositionsInBurst is the time-domain transmission position of the sync block within the half-frame time window.

Preferably, the sync block setting unit is configured to select a sync block time domain position information from the sync block time domain position resource pool of the system, and the sync block time domain position information is related to at least N+1 other IAB nodes The time-domain position information of the sync blocks does not conflict.

To sum up, the above are only preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (6)

1. A synchronous block configuration method for accessing a backhaul integrated network, characterized in that, comprising: When each access backhaul integrated IAB node N _IAB-i accesses the NR IAB network, it obtains the time domain position information of the synchronization block used by other IAB nodes in the current NR IAB network; The IAB node N _IAB-i , according to the time-domain location information, selects from the synchronization block time-domain location resource pool suitable for this node in accordance with the principle of ensuring at least N available backup backhaul links. The time domain position of the synchronization block used, and the time domain position is reported to the network side, N is the preset minimum number of backup backhaul links, and N is greater than or equal to 1. 2. The method according to claim 1, wherein the time domain position information is a combination of three parameters: SSB-PeriodicityServingCell, n-hf and SSB-PositionsInBurst, wherein SSB-PeriodicityServingCell is the transmission period of a sync block , n-hf is the half-frame time window occupied by the sync block in one frame, and SSB-PositionsInBurst is the time-domain transmission position of the sync block within the half-frame time window. 3. The method according to claim 1, wherein selecting the time domain position of the synchronization block suitable for use by the node from the synchronization block time domain position resource pool of the system comprises: A sync block time domain position information is selected from the sync block time domain position resource pool of the system, and the sync block time domain position information does not conflict with the sync block time domain position information of at least N+1 other IAB nodes. 4. A synchronous block configuration device for accessing a backhaul integrated network, characterized in that it comprises: The information acquisition unit is used for each access backhaul integrated IAB node N _IAB-i to obtain the time domain position information of the synchronization block used by other IAB nodes in the current NR IAB network when accessing the NR IAB network; The synchronization block setting unit is used to select the time domain location information from the synchronization block time domain location resource pool of the system according to the principle of ensuring that there are at least N available backup backhaul links according to the time domain location information obtained by the IAB node N _IAB-i , select the time-domain position of the synchronization block suitable for this node, and report the time-domain position to the network side, N is the preset minimum number of backup backhaul links, and N is greater than or equal to 1. 5. The device according to claim 4, wherein the time-domain position information is a combination of three parameters: SSB-PeriodicityServingCell, n-hf and SSB-PositionsInBurst, wherein SSB-PeriodicityServingCell is the transmission period of a sync block , n-hf is the half-frame time window occupied by the sync block in one frame, and SSB-PositionsInBurst is the time-domain transmission position of the sync block within the half-frame time window. 6. The device according to claim 4, wherein the sync block setting unit is configured to select a sync block time domain position information from the sync block time domain position resource pool of the system, the sync block time domain The location information does not conflict with the synchronization block time-domain location information of at least N+1 other IAB nodes.

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