CN110913471B

CN110913471B - Synchronization method and system for radio remote unit of central unit of base station

Info

Publication number: CN110913471B
Application number: CN201911303400.9A
Authority: CN
Inventors: 栾琨明; 高中有; 景叔武
Original assignee: Sichuan Tianyi Comheart Telecom Co Ltd
Current assignee: Sichuan Tianyi Comheart Telecom Co Ltd
Priority date: 2019-12-17
Filing date: 2019-12-17
Publication date: 2020-12-25
Anticipated expiration: 2039-12-17
Also published as: CN110913471A

Abstract

The present invention relates to the field of communications technologies, and in particular, to a method and a system for synchronizing remote radio units of a central unit of a base station, wherein the method for synchronizing remote radio units of a central unit of a base station includes the following steps of, S1: calculating a first time delay T1n and a maximum RRU time delay T1nmax between each RRU and the rHUB with the mapping relation, and executing S2; s2: calculating a second time delay T2n between each rHUB and the BBU, and executing S3; s3, calculating the maximum reporting delay Tmax according to the first delay T1n and the second delay T2n, wherein the Tmax is max (T1n + T2 n); execution of S4; s4: the nth RRU receives data from the antenna, sends the data to the rHUB which has a mapping relation with the RRU, the rHUB performs data combination, the data received by the plurality of RRUs are combined into one path, and the rHUB delays and sends the path of data to the BBU. The invention has the advantage of solving the problem of alignment of wireless signal air interfaces under the condition of 5G complex networking.

Description

Synchronization method and system for radio remote unit of central unit of base station

Technical Field

The invention relates to the technical field of communication, in particular to a method and a system for synchronizing Radio Remote Units (RRUs) of a central unit of a base station.

Background

In 5G base station deployment, there may be a multiple rHUB-based remote radio unit deployment scheme, and under this deployment scheme, the lengths of optical fibers from each rHUB to the remote radio unit are different, especially a deployment scheme of multi-stage rHUB cascade, referring to fig. 1, according to the architecture planning of an operator for a 5G network, multiple rhubs may be connected under 1 BBU, and each rHUB may be connected with 8 RRUs at most. Such connections result in differences in the length of the cable connections due to differences in the location of the devices, thereby resulting in inconsistencies in time delays. And 5g communication requires that wireless signals need to be aligned strictly at an air interface, otherwise, demodulation at a receiving end is difficult.

Disclosure of Invention

The invention aims to provide a synchronization method and a system for a radio remote unit of a central unit of a base station, which have the advantage of solving the problem of alignment of wireless signal air interfaces under the condition of 5G complex networking.

In order to achieve the purpose, the technical scheme adopted by the invention is as follows: a synchronization method for remote radio units of a central unit of a base station includes the following steps,

s1: calculating a first time delay T1n and a maximum RRU time delay T1nmax between each RRU and the rHUB with the mapping relation, and executing S2;

s2: calculating a second time delay T2n between each rHUB and the BBU, and executing S3;

s3, calculating the maximum delivery delay Tmax according to the first delay T1n and the second delay T2n, wherein the Tmax is max (T1n + T2 n); execution of S4;

s4: the nth RRU receives data from an antenna, sends the data to an rHUB which has a mapping relation with the RRU, the rHUB performs data combination, combines the data received by a plurality of RRUs into one path, and sends the rHUB to the BBU with an rHUB delay (Tmax-T2n-T1nmax), wherein T1nmax is the maximum first time delay between the nth rHUB and the RRU which has the mapping relation with the nth rHUB, and T2n is the second time delay between the nth rHUB and the BBU.

Preferably, the S1 includes the following steps:

s11: each rHUB sends a first time scale signal to the RRU with the mapping relation, the rHUB records that the first sending time is T1, and S12 is executed;

s12: the RRU receives the first time mark signal, records that the first receiving time is T2, and sends the first time mark signal, the first receiving time is T2 and the information of the second sending time T3 to the rHUB which has a mapping relation with the RRU at the second sending time T3, and the rHUB records the second receiving time T4 and executes S13;

s13: calculating a first time delay T1n for each RRU, wherein T1n ═ (T4-T3+ T2-T1)/2, performing S14;

s14, the longest first time delay T1n of the nth rHUB and the RRUs with the mapping relation is the maximum first time delay T1nmax between the nth rHUB and the RRUs with the mapping relation, and S2 is executed.

Preferably, the S2 includes the following steps:

s21: each BBU sends a second time scale signal to the rHUB with the mapping relation, records a third sending time as T5, and executes S22;

s22: the rHUB receives the second time scale signal, records that the third receiving time is T6, sends the information of the second time scale signal, the third receiving time is T6 and the fourth sending time T7 to the BBU at the fourth sending time T7, records the fourth receiving time T8, and executes S23;

s23: a second time delay T2n is calculated between each rHUB and BBU, where T2n ═ (T8-T7+ T6-T5)/2, S3 is performed.

A synchronization method for remote radio units of a central unit of a base station includes the following steps,

s1: calculating a first time delay T1n between each RRU and the rHUB with the mapping relation, and executing S2;

s4: the method comprises the steps that data are sent to an rHUB which has a mapping relation with the RRU by the BBU, the rHUB receives the data sent by the BBU and splits the data into multiple paths of data, and an rHUB delay (Tmax-T1n-T2n) is sent to the RRU, wherein T1n is a first delay between the rHUB and the RRU which has the mapping relation with the rHUB, and T2n is a second delay between the rHUB and the BBU.

Preferably, the S1 includes the steps of,

s13: a first time delay T1n is calculated for each RRU, where T1n is (T4-T3+ T2-T1)/2, and S2 is performed.

Preferably, the S2 includes the steps of,

A synchronization system of radio remote unit for central unit of base station comprises BBU, at least one rHUB cascaded with BBU, and at least one RRU cascaded with rHUB,

the RRU is used for receiving data from an antenna;

the rHUB is used for calculating a first delay T1n between the rHUB and each RRU mapped to the rHUB according to the method in claim 2, calculating a second delay T2n between the rHUB and each BBU according to the method in claim 3, and calculating a maximum reporting delay Tmax which is max (T1n + T2n) according to the first delay T1n and the second delay T2 n;

the BBU is used for receiving data uploaded by the rHUB;

the rHUB is further used for receiving data sent by the RRUs, caching the data, merging the data received by the multiple RRUs into one path, and sending the path of the data to the BBU by delaying (Tmax-T2n-T1nmax), wherein T1nmax is a maximum first time delay between the nth rHUB and the RRU having a mapping relation with the nth rHUB, and T2n is a second time delay between the nth rHUB and the BBU.

A synchronization system of radio remote unit for a central unit of a base station comprises a BBU, at least one rHUB cascaded with the BBU and at least one RRU cascaded with the rHUB;

the RRU is used for receiving data sent by the rHUB;

the rHUB is used for calculating a first time delay T1n between the rHUB and each RRU which has a mapping relation with the rHUB according to the method of claim 2 or 5, calculating a second time delay T2n between the rHUB and the BBU according to the method of claim 3 or 6, and calculating a maximum delivery time delay Tmax which is max (T1n + T2n) according to the first time delay T1n and the second time delay T2 n;

the BBU is used for transmitting data to the rHUB;

the rHUB is also used for receiving data sent by the BBU, caching the data, splitting the data into multiple paths of data, and delaying (Tmax-T1n-T2n) to send the data to the RRU.

the RRU is used for receiving data sent by the rHUB, receiving data transmitted by an antenna and transmitting the data to the rHUB;

the rHUB is used for calculating a first time delay T1n between the rHUB and each RRU which has a mapping relation with the rHUB according to the method of claim 2 or 5, and is also used for calculating a second time delay T2n between the rHUB and the BBU according to the method of claim 3 or 6, and calculating a maximum time delay Tmax which is max (T1n + T2n) according to the first time delay T1n and the second time delay T2 n;

the BBU is used for transmitting data to the rHUB and receiving the data transmitted by the rHUB;

the rHUB is further used for receiving data sent by the BBU, caching the data and splitting the data into multiple paths of data, and the rHUB is delayed (Tmax-T1n-T2n) and sent to the RRU, wherein T1n is a first time delay between the rHUB and the RRU which has a mapping relation with the rHUB, and T2n is a second time delay between the rHUB and the BBU; the rHUB is further used for receiving data sent by the RRUs, caching the data, merging the data received by the multiple RRUs into one path, and sending the path of the data to the BBU by delaying (Tmax-T2n-T1nmax), wherein T1nmax is a maximum first time delay between the nth rHUB and the RRU having a mapping relation with the nth rHUB, and T2n is a second time delay between the nth rHUB and the BBU.

In conclusion, the beneficial effects of the invention are as follows:

1. the invention has the advantages of solving the problem of alignment of wireless signal air interfaces under the condition of 5G complex networking;

2. the invention completes the synchronous work by the rHUB, reduces the working intensity of the RRU and improves the data synchronous processing capability of the system.

Drawings

FIG. 1 is a schematic diagram of a prior art structure;

FIG. 2 is a schematic flow chart of example 1;

fig. 3 is a schematic flowchart of calculating a first time delay T1n between each RRU and the rHUB with mapping relationship;

FIG. 4 is a schematic flow chart of the calculation of the second time delay T2n between each rHUB and BBU;

FIG. 5 is a schematic flow chart of example 2;

FIG. 6 is a schematic flow chart of example 3;

fig. 7 is a schematic diagram of a synchronization system for remote radio units of a central unit of a base station according to

embodiments

4, 5, and 6 of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention are clearly and completely described below with reference to fig. 2 to 7 of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example 1

Referring to fig. 2, a synchronization method for a remote radio unit of a central unit of a base station includes the steps of,

s4: the nth RRU receives data from an antenna, sends the data to an rHUB which has a mapping relation with the RRU, the rHUB performs data combination, the rHUB combines the data sent by the nth RRU after delaying T1nmax-T1n, combines the data received by multiple RRUs into one path, and sends the rHUB delay (Tmax-T2n-T1nmax) to the BBU, wherein T1nmax is the maximum first delay between the nth rHUB and the RRU which has the mapping relation with the nth rHUB, and T2n is the second delay between the nth rHUB and the BBU.

Referring to fig. 3, S1 includes the steps of:

Referring to fig. 4, S2 includes the steps of:

Example 2

Referring to fig. 5, a method for synchronizing remote radio units of a central unit of a base station includes the steps of,

Referring to fig. 3, S1 includes the steps of,

Referring to fig. 4, S2 includes the steps of,

Example 3

Referring to fig. 6, a method for synchronizing remote radio units of a central unit of a base station includes the steps of,

s2: calculating a second time delay T2n between each rHUB and BBU, calculating a maximum time delay Tmax, which is max (T1n + T2n), from the first time delay T1n and the second time delay T2n, and performing S3;

s3: judging whether the RRU receives data, if so, executing S4;

s4: the nth RRU receives data from an antenna, sends the data to an rHUB which has a mapping relation with the RRU, the rHUB performs data combination, the rHUB combines the data sent by the nth RRU after delaying T1nmax-T1n, combines the data received by a plurality of RRUs into one path, and sends the rHUB delay (Tmax-T2n-T1nmax) to the BBU, wherein T1nmax is the maximum first delay between the nth rHUB and the RRU which has the mapping relation with the nth rHUB, and T2n is the second delay between the nth rHUB and the BBU;

s5: judging whether the BBU needs to send data to the RRU or not, if so, executing S6;

s6: the method comprises the steps that a BBU sends data to an rHUB which has a mapping relation with the RRU, the rHUB receives the data sent by the BBU and splits the data into multiple paths of data, and an rHUB delay (Tmax-T1n-T2n) is sent to the RRU, wherein T1n is a first delay between the rHUB and the RRU which has the mapping relation with the rHUB, and T2n is a second delay between the rHUB and the BBU.

Referring to fig. 3, S1 includes the steps of,

Referring to fig. 4, S2 includes the steps of,

Example 4

Referring to fig. 7, a synchronization system for a remote radio unit of a central unit of a base station includes a BBU, two rhubs cascaded with the BBU, and three RRUs cascaded with the rhubs, where the remote fiber distances between the three RRUs cascaded with one rHUB and the rHUB are 100M, 200M, and 300M, respectively, and the remote fiber distances between two rhubs and the BBU are 100M and 300M, respectively.

The RRU is used for receiving data from an antenna;

the rHUB is used for calculating a first time delay T1n between each RRU which has a mapping relation with the RRU, and also used for calculating a second time delay T2n between the RRU and the BBU and a maximum reporting time delay Tmax, wherein Tmax is max (T1n + T2 n);

the BBU is used for receiving the data uploaded by the rHUB;

the rHUB is also used for receiving data sent by the RRUs, the rHUB performs data combination, the rHUB delays the data sent by the nth RRU by T1nmax-T1n and then combines the data, the data received by the multiple RRUs are combined into one path, and the delay (Tmax-T2n-T1nmax) is sent to the BBU, wherein T1nmax is the maximum first delay between the nth rHUB and the RRU which has a mapping relation with the nth rHUB, and T2n is the second delay between the nth rHUB and the BBU.

It is worth noting that rHUB calculates the first time delay T1n between it and RRU having a mapping relation according to the following steps,

and S14, the longest first time delay T1n between the nth rHUB and the RRU with the mapping relation is the maximum first time delay T1nmax between the nth rHUB and the RRU with the mapping relation.

It is worth noting that the rHUB calculates the second delay T2n and the maximum rHUB delay Tmax2 between it and the BBU according to the following steps,

s23: a second time delay T2n is calculated between each rHUB and BBU, where T2n ═ (T8-T7+ T6-T5)/2.

In an uplink, after data of three RRUs reach the rHUB, the first rHUB delays the data of the three RRUs by 200M, and 200M distance delay respectively according to the distance, and the second rHUB delays the data of the three RRUs by 0M, and 0M distance delay respectively according to the distance, so that the data synchronously reach the BBUs.

Example 5

The RRU is used for receiving data sent by the rHUB;

the rHUB is used for calculating a first time delay T1n between each RRU which has a mapping relation with the RRU, and also used for calculating a second time delay T2n between the RRU and the BBU and a maximum delivery time delay Tmax, wherein Tmax is max (T1n + T2 n);

the BBU is used for transmitting data to the rHUB;

the rHUB is further used for receiving data sent by the BBU, buffering the data, splitting the data into multiple paths of data, and sending the multiple paths of data to the RRUs with a delay (Tmax-T1n-T2n), wherein T1n is a first delay between the rHUB and the RRU which has a mapping relation with the rHUB, and T2n is a second delay between the rHUB and the BBU.

It is worth noting that the rHUB calculates a second time delay T2n between it and the BBU according to the following steps,

That is, in the downlink, data sent to six RRUs is sent, the first rHUB delays the data sent to the three RRUs by the remote distance delays of 400M, 300M, and 200M, respectively, and the second rHUB delays the data sent to the three RRUs by the remote distance delays of 200M, 100M, and 0M, respectively, so that the data reaches the six RRUs synchronously.

Example 6

The RRU is used for receiving the data sent by the rHUB, receiving the data transmitted by the antenna and transmitting the data to the rHUB;

the rHUB is used for calculating a first time delay T1n between each RRU which has a mapping relation with the RRU, and also used for calculating a second time delay T2n and a maximum time delay Tmax between the RRU and the BBU, wherein the Tmax is max (T1n + T2 n);

the rHUB is further used for receiving data sent by the BBU, splitting the data into multiple paths of data, caching the data, and sending the data to the RRUs in a delayed manner (Tmax-T1n-T2n), wherein T1n is a first time delay between the rHUB and the RRU which has a mapping relation with the rHUB, and T2n is a second time delay between the rHUB and the BBU; the rHUB is further used for receiving data sent by the RRUs, caching the data, merging the data by the rHUB, merging data sent by the nth RRU after delaying T1nmax-T1n by the rHUB, merging the data received by the multiple RRUs into one path, and sending the delay (Tmax-T2n-T1nmax) to the BBU, wherein T1nmax is the maximum first delay between the nth rHUB and the RRU having a mapping relation with the nth rHUB, and T2n is the second delay between the nth rHUB and the BBU.

In the description of the present invention, it is to be understood that the terms "counterclockwise", "clockwise", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are used for convenience of description only, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be considered as limiting.

Claims

1. A method for synchronizing remote radio units of a central unit of a base station, comprising the steps of,

s3, calculating the maximum reporting delay Tmax according to the first delay T1n and the second delay T2n, wherein Tmax = max (T1n + T2 n); execution of S4;

s4: the nth RRU receives data from an antenna, sends the data to an rHUB which has a mapping relation with the RRU, the rHUB performs data combination, combines the data received by a plurality of RRUs into one path, and sends an rHUB delay (Tmax-T2n-T1nmax) to the BBU, wherein T1nmax is the maximum first delay between the nth rHUB and the RRU which has the mapping relation with the nth rHUB, and T2n is the second delay between the nth rHUB and the BBU;

the S1 includes the steps of:

s13: calculating a first time delay T1n for each RRU, wherein T1n = (T4-T3+ T2-T1)/2, and executing S14;

s14, the longest first time delay T1n of the nth rHUB and the RRUs with the mapping relation is the maximum first time delay T1nmax between the nth rHUB and the RRUs with the mapping relation, and S2 is executed;

the S2 includes the steps of:

s23: calculating a second time delay T2n between each rHUB and BBU, wherein T2n = (T8-T7+ T6-T5)/2, performing S3;

the synchronization method for the remote radio unit of the base station central unit further comprises the steps that the rHUB receives data sent by the BBU and splits the data into multiple paths of data, and the steps are as follows:

step a: calculating a first time delay T1n between each RRU and the rHUB with the mapping relation, and executing the step b;

step b: calculating a second time delay T2n between each rHUB and the BBU, and executing S3;

c, calculating the maximum issuing delay Tmax according to the first delay T1n and the second delay T2n, wherein Tmax = max (T1n + T2 n); execution of S4;

step d: the method comprises the steps that a BBU sends data to an rHUB which has a mapping relation with an RRU, the rHUB receives the data sent by the BBU and splits the data into multiple paths of data, and an rHUB delay (Tmax-T1n-T2n) is sent to the RRU, wherein T1n is a first delay between the rHUB and the RRU which has the mapping relation with the rHUB, and T2n is a second delay between the rHUB and the BBU;

wherein the step a comprises the following steps,

step e: each rHUB sends a first time scale signal to the RRU with the mapping relation, the rHUB records that the first sending time is T1, and step f is executed;

step f: the RRU receives the first time mark signal, records that the first receiving time is T2, and sends the first time mark signal, the first receiving time is T2 and the information of the second sending time T3 to the rHUB which has a mapping relation with the RRU at the second sending time T3, and the rHUB records the second receiving time T4 and executes the step g;

step h: calculating a first time delay T1n of each RRU, wherein T1n = (T4-T3+ T2-T1)/2, and executing the step b;

wherein the step b comprises the following steps,

step i: each BBU sends a second time scale signal to the rHUB with the mapping relation, records a third sending time as T5, and executes the step j;

step j: the rHUB receives the second time scale signal, records that the third receiving time is T6, sends the information of the second time scale signal, the third receiving time is T6 and the fourth sending time T7 to the BBU at the fourth sending time T7, records the fourth receiving time T8, and executes the step k;

step l: calculating a second time delay T2n between each rHUB and BBU, wherein T2n = (T8-T7+ T6-T5)/2, performing step c.

2. A synchronization system for a radio remote unit of a central unit of a base station, comprising a BBU, at least one rHUB cascaded with the BBU, and at least one RRU cascaded with the rHUB, wherein the BBU, the at least one rHUB cascaded with the BBU, and the at least one RRU cascaded with the rHUB are configured to perform the synchronization method of claim 1.