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User terminal and channel access method

A channel access method and channel access technology, applied in the field of user terminals and channel access, can solve problems such as inability to obtain channel state information, inability to decode nodes, inability to complete FI message processing, etc.

Active Publication Date: 2015-04-29
DATANG GOHIGH INTELLIGENT & CONNECTED TECH (CHONGQING) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Considering the processing delay, there are the following problems: within one frame, the node cannot decode the information received from monitoring all time slots in one frame, that is, it may not be able to obtain the complete channel state information of one frame, and it is impossible to base This information makes correct slot selection
After considering the processing delay, there are the following problems: 1) The receiving node cannot perform positive feedback in real time; assuming that node A selects time slot 2 and sends FI when time slot 2 arrives, then node B occupying time slot 3, even The FI of node A is received correctly in time slot 2, but the processing of the FI message cannot be completed, that is, the FI sent by node B in time slot 3 cannot give positive feedback to node A in time slot 2; 2) this The node cannot know the feedback information of all receiving slots to its sending slots within 1 frame
There is no solution to this problem in the current algorithm. When considering the processing delay, this problem needs to be explained

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0253] In this embodiment, the length of the listening window remains unchanged, and the internal time slot status table is updated according to the receiving time slot of the PHY layer.

[0254] Such as Figure 9 As shown, in this embodiment, the frame length is 5 time slots, and the total delay is 1.5 ms. Node B occupies time slot 0, and node C occupies time slot 2, including the following steps:

[0255] Step 1, monitor in the monitor window

[0256] The length of the listening window is still 1 frame, that is, from time slot 0 to time slot 4.

[0257] After the monitoring is over, due to the processing delay, the node can only decode the FI information received from time slot 0 to time slot 3 in the monitoring window:

[0258] 1) If the node is connected for the first time, only the information of these 4 time slots is available at this time;

[0259] 2) If the node determines that the channel maintenance fails to access during the maintenance process, the node has cac...

Embodiment 2

[0275] In this embodiment, the monitoring window is extended, and the internal time slot status table is updated according to the receiving time slot of the PHY layer (the time slot number of the MAC layer does not match the number of the PHY time slot).

[0276] In this embodiment, the total delay / time slot length is rounded down to 1 time slot, and the frame length is 5 time slots.

[0277] Compared with Embodiment 1, the main difference lies in the monitoring window, and only this part will be described, and other parts are analogous to Embodiment 1, and will not be repeated here.

[0278] To extend the listening window:

[0279] The duration of the listening window is determined to be 5 time slots in one frame + 1 time slot = 6 time slots.

[0280] Such as Figure 10 As shown, the node monitors 6 time slots starting from time slot 0. Clear the buffer before starting to monitor. After the monitoring ends, the node obtains the decoded FI messages received from time slot 0 t...

Embodiment 3

[0283] In this embodiment, the length of the listening window remains unchanged, and the internal time slot state table is updated according to the decoding time slot of the PHY layer.

[0284] Compared with Embodiment 1, this embodiment differs mainly in that the node updates the internal time slot state table according to the PHY layer decoding time slot for the received FI decoding result.

[0285] Such as Figure 11 As shown, it is assumed that node B occupies time slot 0, and node B sends FI feedback message in time slot 0. Considering the processing delay, node A can decode it in time slot 1 of the listening window, and node A records time slot 1 The state of is (slot 1 is occupied by Node B);

[0286] If time slot 3 is selected according to the time slot state table, it is necessary to derive the PHY receiving time slot according to the total delay, that is, it means that time slot 2 is idle, and then send FI on MAC (PHY) slot2.

[0287] Based on the same inventive co...

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Abstract

The invention relates to a user terminal and a channel access method. The method comprises the following steps of continuously monitoring feedback information in a monitoring window with a time length of 1 frame or more than 1 frame in case of initial access or channel access / maintenance failure; selecting a transmission time slot after monitoring, and transmitting FI (Frame Information) when the transmission time slot is due and when a channel access failure is not determined; performing monitoring in receiving time slots, except the transmission time slot, in a feedback window, wherein the time length of the feedback window is more than 1 frame; when the monitoring in the feedback window is finished, determining that channel access is successful according to a monitoring result, monitoring each receiving time slot, except the transmission time slot, and if a channel maintenance failure is not determined before the transmission time slot is due, transmitting the FI when the transmission time slot is due. According to the user terminal and the channel access method, channel occupation information in a complete frame can be obtained in the monitoring window, time slot occupation conditions fed back by all nodes can be obtained in the feedback window, and the correct processing of feedback messages is ensured.

Description

technical field [0001] The present invention relates to the technical field of wireless communication, in particular to a user terminal and a channel access method. Background technique [0002] RR-ALOHA (Reliable Reservation ALOHA, Reliable Reservation ALOHA) is an access and resource allocation mechanism based on TDMA (Time Division Multiple Access, Time Division Multiple Access). When a node occupies a time slot, it will periodically send frame information FI (Frame Information) with a fixed information organization structure to indicate the time slot allocation occupancy from the perspective of the node, and according to the FI of the neighboring node and its own channel The usage status updates the time slot occupancy state in time, and reflects the updated time slot occupancy state in the FI sent by itself. [0003] The whole process can be divided into a channel occupation process and a channel maintenance process. [0004] 1. Channel occupation process [0005] In...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W74/08H04L1/16
CPCH04L1/1607H04W74/085
Inventor 冯媛赵毅赵丽房家奕李凤
Owner DATANG GOHIGH INTELLIGENT & CONNECTED TECH (CHONGQING) CO LTD
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