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Time division duplex/time division multiple access channel plan frame encoding method
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A time division multiple access and time division duplex technology, which is applied in the fields of communication, local area network and access network, can solve the problems of reduced channel utilization, low coding efficiency, and reduced time slots for transmitting valid data frames, so as to reduce the coding length. , the effect of reducing overhead and improving channel utilization
Active Publication Date: 2013-07-24
BEIJING HANNUO TECH
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[0005] The above two methods of planning frame coding are the basic methods usually used in local area networks and access networks that allocate channel resources based on the reporting / authorization mechanism, but both methods have the disadvantage of low coding efficiency
[0006] In the local area network and access network, usually the number of time slots and the number of nodes are large, at this time the number of bits occupied by the coding of the planning frame will be large, and the planning frame is to be sent in the time slot in the planning cycle, so the planning The overhead of the frame will reduce the time slot for transmitting valid data frames, which will eventually lead to a decrease in channel utilization
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Embodiment 1
[0042] refer to figure 1 , the implementation steps of this example are as follows:
[0043] Step 1, set up the network environment.
[0044] In this example, set the network to consist of 1 central node and 64 slave nodes, and the slave nodes are numbered from 1 to 64; each planning cycle contains 150 fixed-length time slots, which are sequentially composed of uplink time slots and downlink time slots;
[0045] Step 2, define the codewords to be used in the planning frame.
[0046] Define four codewords to indicate the use of time slots and node separators in the planning cycle, where the first codeword indicates that the corresponding time slot is used for transmitting data frames, and the second codeword indicates that the corresponding time slot is used for transmission planning frame, the third type of codeword indicates that the corresponding time slot is used to transmit a reserved frame, and the fourth type of codeword is a node separator codeword.
[0047] Step 3,...
Embodiment 2
[0066] refer to figure 1 , the implementation steps of this example are as follows:
[0067] Step 1, set up the network environment.
[0068] In this example, the network is set to consist of 1 central node and 64 slave nodes, and the slave nodes are numbered from 1 to 64; each planning cycle contains 143 fixed-length time slots, which are sequentially composed of downlink time slots and uplink time slots, among which, The 1st time slot to the 11th time slot is a fixed downlink period, the 126th time slot to the 140th time slot is a fixed uplink period, and the 12th time slot to the 125th time slot is variable uplink and downlink Period, the last 3 time slots of each downlink period and uplink period are used as uplink and downlink switching intervals, planning frames occupy the 5th to 7th time slots, and reserved frames occupy the 130th to 136th time slots time slots.
[0069] Step 2, defining codewords to be used in the planning frame.
[0070] Define four kinds of code...
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Abstract
The invention discloses a time division duplex / time division multiple access channel plan frame encoding method which mainly solves the problem that the conventional channel plan frame encoding efficiency is low. The method comprises the following implementation steps: setting a network environment, and determining the number of central nodes and slave nodes in the network; defining K code words comprising (K-1) purpose code words and one node separator code word according to the specific time slot purpose, and encoding the K code words; then determining a time slot distribution result in the next plan period, and putting the purpose code words at the corresponding positions in the plan frame according to the time slot distribution result in the next plan period; and finally, inserting the node separator code word to finish the channel plan frame encoding. According to the method, the channel plan frame encoding length is effectively reduced, the overhead of the plan frame during channel transmission is reduced, the channel utilization rate is improved, the equipment requirement is low, and the method can be applied to the fields of various local area networks and access networks by employing time division duplex / time division multiple access communication.
Description
technical field [0001] The invention belongs to the technical field of communication, and relates to a channel planning frame coding method, which can be applied to the fields of various local area networks and access networks adopting time division duplex / time division multiple access communication. Background technique [0002] In LANs and access networks based on shared media, in order to achieve reasonable and conflict-free allocation of channel resources, a central point-to-multipoint logical topology is often used. In this network structure, there is a central node that uniformly allocates the use of channel resources, and other nodes except the central node are called slave nodes. Data communication can be directly performed between the central node and the subordinate nodes, and the communication between the subordinate nodes generally needs to be forwarded by the central node. In order to better provide quality of service (QoS) guarantees, the central node often us...
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