CN106488549B - Asynchronous time slot alignment method for special-shaped wireless communication system - Google Patents
Asynchronous time slot alignment method for special-shaped wireless communication system Download PDFInfo
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- CN106488549B CN106488549B CN201611100024.XA CN201611100024A CN106488549B CN 106488549 B CN106488549 B CN 106488549B CN 201611100024 A CN201611100024 A CN 201611100024A CN 106488549 B CN106488549 B CN 106488549B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
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- H—ELECTRICITY
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- H04J3/00—Time-division multiplex systems
- H04J3/02—Details
- H04J3/06—Synchronising arrangements
- H04J3/0635—Clock or time synchronisation in a network
- H04J3/0685—Clock or time synchronisation in a node; Intranode synchronisation
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Abstract
The invention relates to a communication technology of a wireless communication system, and provides an asynchronous time slot alignment method suitable for a special-shaped wireless communication system, which comprises the following steps: determining the time slot length and period of two sides for communication according to the time slot distribution condition of two sides communication system; extracting the length of the overlapping time slots of the two parties according to the length and the period of the respective communication time slot; the length of the overlapping time slots of the two parties is divided into a plurality of sub-time slots, and the sub-time slots are used as the minimum time slot unit to carry out the design of the transmitting and receiving time slots. The method of the invention realizes the alignment of the receiving and sending time slots of different types of communication systems under the conditions of asynchronous starting time and unmatched time slot length, and lays a foundation for asynchronous communication among special-shaped communication systems.
Description
Technical Field
The invention relates to a communication technology of a wireless communication system, in particular to an asynchronous time slot alignment method suitable for a special-shaped wireless communication system.
Background
The technical problem to be solved is the synchronization of the receiving and transmitting time slots between the wireless communication systems.
The current common solution for time slot synchronization is to utilize GPS or other time-management devices to perform unified time service on each communication system, so as to synchronize the time of each system. On the basis of time synchronization, each system performs communication based on a pre-designed transmission/reception time slot. A disadvantage of the above solution is that the implementation of the communication between the wireless communication systems relies on external timing equipment. If the system signal quality is not good enough when the severe environment is met, or the GPS time service is abnormal and can not be used normally, the precise time synchronization can not be realized, and the alignment of the receiving and transmitting time slots can not be carried out, thereby causing the communication failure.
Based on the above technical problem, the present invention provides an alignment method for transmitting/receiving time slots between wireless communication systems independent of time system devices, that is, an asynchronous time slot alignment method for wireless communication systems.
Disclosure of Invention
The invention aims to realize communication between wireless communication systems under the condition of no time service of time management equipment. By the design of dividing the receiving and transmitting time slots of the communication system, an asynchronous time slot alignment method of the special-shaped wireless communication system is provided.
The technical scheme of the invention comprises the following steps:
a. determining the length and the period of the time slot of the two-party communication according to the time resource which is allocated by the two-party communication system and is used for communication;
b. extracting the length of the communication time slot overlapped by the two parties according to the length and the period of the communication time slot of the two parties;
c. dividing the length of the overlapping time slots of the two parties into a plurality of sub-time slots, and designing the transmitting and receiving time slots by taking the sub-time slots as the minimum time slot unit, wherein the specific steps are as follows:
c1. dividing the overlapped time slot into N equal parts, wherein each equal part is a sub-time slot, and the length of each sub-time slot needs to meet the minimum transmission time limit of a communication system;
c2. taking integers i and j, wherein the two communication systems respectively transmit by using the sub-time slot length i times and the sub-time slot length j times as a period, each transmission time is one sub-time slot, and the two transmission gaps are used for receiving, wherein i and j meet the following conditions: (1) i is more than or equal to 3, j is less than N; (2) i, j cannot be evenly divided by each other; (3)
and is
The invention has the beneficial effects that: the method of the invention realizes the alignment of the receiving and sending time slots of different types of communication systems under the conditions of time asynchronization and time slot length mismatching, and lays a foundation for asynchronous communication among special-shaped communication systems.
Drawings
Fig. 1 is a flow chart of an asynchronous slot alignment method.
Fig. 2 is a schematic diagram of overlapping communication slot lengths.
Fig. 3 is a schematic diagram of communication transceiving time slot design.
Fig. 4 is a diagram illustrating asynchronous transceiving time slot alignment.
Detailed Description
The invention is described below with reference to the accompanying drawings and specific embodiments. The asynchronous time slot alignment method of the present invention has a flow chart as shown in fig. 1, and includes the following steps:
a. determining the length and the period of the time slot of the two-party communication according to the time resource which is allocated by the two-party communication system and is used for communication;
b. extracting the length of the communication time slot overlapped by the two parties according to the length and the period of the communication time slot of the two parties;
c. the length of the overlapping time slots of the two parties is divided into a plurality of sub-time slots, and the sub-time slots are used as the minimum time slot unit to carry out the design of the transmitting and receiving time slots.
In the present embodiment, two types of communication systems are considered, and a communication system a and a communication system B are used respectively. Setting the communication system A to communicate for 10s at intervals of 60s for the time slot length and the period in the step a; the communication system B communicates 140s every 300 s.
The length of the two overlapping communication time slots in step B needs to consider the factor of time asynchronization of the two communication systems, as shown in fig. 2, the 10s time slots used by the communication system a for communication are marked by thick thin lines in the figure, and when the 140s time slots used by the communication system B for communication are not synchronized with the time slots of the communication system a (shown as an offset of the starting position of 140s in the figure), it can be seen from the figure that no matter how many the starting offsets of the communication time slots of the two communication systems are, at least two consecutive 10s overlapping time slots exist in each 140s time slot of the communication system a and the communication system B. Since the same transceiving time slot design can be adopted for the two 10s overlapping time slots, in the present embodiment, one of the 10s is taken as the overlapping time slot for the time slot alignment design.
In this embodiment, the method for dividing and designing the sub-slot in step c includes the following specific steps:
c1. taking N as 10, namely dividing the 10s overlapped time slot into 10 sub time slots with the length of 1 s;
c2. taking integers i-3 and j-4, communication system a is designed to transmit once in a period of 3s, communication system B is designed to transmit once in a period of 4s, and the time slot between two transmissions is used for receiving. Through calculation, i and j can satisfy the following conditions: (1) i is more than or equal to 3, j is less than N; (2) i, j cannot be evenly divided by each other; (3)
and is
After the design of step c, the communication transceiving time slots of the communication system a and the communication system B are shown in fig. 3.
As can be appreciated from fig. 2, the 10s communication time slot of communication system a may overlap with any portion of the 140s communication time slots of communication system B. With the transceiving slot design shown in fig. 3, it can be ensured that no matter which part of the 140s communication slots of communication system B the 10s communication slots of communication system a are aligned with, at least one transmission slot of communication system a is a reception slot fully aligned with communication system B, and at least one transmission slot of communication system B is fully received by communication system a. The specific asynchronous transceiving time slot alignment is schematically shown in fig. 4: since the transmission period of communication system a is 1s less than the transmission period of communication system B, the position of each transmission of communication system a falling on the slot of communication system B will be shifted to the left by 1s relative to the position of the last transmission of communication system a, and the four transmissions of communication system a cover exactly different positions on one period (4s) of communication system B, since the receive slot of communication system B is 3s long, which ensures that at least two transmissions of communication system a can be received by communication system B in each 10 s. Similarly, at each 10s, it is ensured that the transmission of communication system B can be received by communication system a at least once.
It can be seen from the above description of the present invention that the present invention can realize the alignment of the receiving and transmitting time slots of both parties under the condition that the communication time slot lengths and periods of both parties' communication systems are different and the time is not synchronous.
Claims (1)
1. An asynchronous time slot alignment method of a heterogeneous wireless communication system comprises the following steps:
a. determining the length and the period of the time slot of the two-party communication according to the time resource which is allocated by the two-party communication system and is used for communication;
b. extracting the length of the communication time slot overlapped by the two parties according to the length and the period of the communication time slot of the two parties;
c. dividing the overlapped time slots of the two parties into a plurality of sub-time slots, and designing the transmitting and receiving time slots by taking the sub-time slots as the minimum time slot unit, which comprises the following steps:
c1. partitioning overlapping time slots into
Equal parts, each equal part is a sub-time slot, wherein the length of each sub-time slot needs to meet the minimum transmission time limit of a communication system;
c2. taking integers
And
the two communication systems are respectively provided with
Multiple sub-slot length and
transmitting in a period of multiple sub-time slot length, each time length is one sub-time slot, and the two-time transmission interval is used for receiving, whereinAnd
the following conditions are satisfied: (1)
；（2）
、cannot be divided by the other party; (3)
and is
。
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Citations (5)
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|---|---|---|---|---|
| CN1291015A (en) * | 1999-09-30 | 2001-04-11 | 深圳市华为技术有限公司 | Public pilot frequency channel structure in code division multiple access communication system |
| CN101094517A (en) * | 2007-06-21 | 2007-12-26 | 南京航空航天大学 | Improved time synchronization method |
| CN102752843A (en) * | 2012-06-20 | 2012-10-24 | 中国科学院信息工程研究所 | Time synchronization method |
| CN102958180A (en) * | 2011-08-24 | 2013-03-06 | 无锡融格物联网科技有限公司 | Method and device for scheduling time slots |
| CN104968029A (en) * | 2015-05-20 | 2015-10-07 | 中国电子科技集团公司第三十八研究所 | Synchronous time division multiple access method suitable for wireless sensing network |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7986700B2 (en) * | 2006-09-25 | 2011-07-26 | Futurewei Technologies, Inc. | Multiplexed data stream circuit architecture |
-
2016
- 2016-12-02 CN CN201611100024.XA patent/CN106488549B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1291015A (en) * | 1999-09-30 | 2001-04-11 | 深圳市华为技术有限公司 | Public pilot frequency channel structure in code division multiple access communication system |
| CN101094517A (en) * | 2007-06-21 | 2007-12-26 | 南京航空航天大学 | Improved time synchronization method |
| CN102958180A (en) * | 2011-08-24 | 2013-03-06 | 无锡融格物联网科技有限公司 | Method and device for scheduling time slots |
| CN102752843A (en) * | 2012-06-20 | 2012-10-24 | 中国科学院信息工程研究所 | Time synchronization method |
| CN104968029A (en) * | 2015-05-20 | 2015-10-07 | 中国电子科技集团公司第三十八研究所 | Synchronous time division multiple access method suitable for wireless sensing network |
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