Method for performing point-to-point off-line direct mode operation under public network time division-long term evolution (TD-LTE)
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A technology of off-net direct connection and communication method, which is applied in wireless communication, synchronization devices, electrical components, etc., and can solve problems such as inability to realize communication
Inactive Publication Date: 2013-06-19
HARBIN INST OF TECH
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However, the following communications (quasi-duplex) are currently not possible in an area without base stations:
Method used
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specific Embodiment approach 1
[0042] The specific embodiment one, the point-to-point off-network direct communication method under the public network TD-LTE,
[0043] Its voice call method between the user who initiates the session and the user who receives the session is realized by the following steps:
[0044] Step A1, the user who initiates the session monitors the PSCH channel, looking for idle continuous bandwidth;
[0045] Step A2, the user initiating the session judges whether an idle continuous bandwidth is found, if the judgment result is yes, then execute step A3; if the judgment result is no, then return to execute step A1;
[0046] Step A3, the user who initiates the session sends preamble information to the PRACH channel;
[0047] Step A4, the receiving session user monitors the PRACH channel, and receives the preamble information sent by the session initiating user in step A3;
[0048] Step A5, the receiving session user synchronously decodes the preamble information sent by the session in...
specific Embodiment approach 2
[0090] Specific embodiment two, the present invention is described below in conjunction with specific embodiment, comprise 3 users in the present embodiment, namely A (promptly initiate session user), B (promptly receive session user) and C (new initiate session user);
[0091] The specific process is:
[0092] 1. A monitors the PSCH channel to find idle continuous bandwidth.
[0093] 2. After A finds enough continuous bandwidth, it sends preamble information (notification of session start) to PRACH;
[0094] The preamble information is as follows:
[0095] The synchronization information of the preamble information: including the primary synchronization signal (Zadoff-Chu sequence) and the secondary synchronization signal (m sequence), the receiving end can obtain the terminal information of A by decoding the synchronization information (decoding process: time synchronization, frequency synchronization);
[0096] Bandwidth information to be occupied by the session: the firs...
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Abstract
The invention discloses a method for performing point-to-point off-line direct mode operation under public network time division-long term evolution (TD-LTE), relates to a method for performing off-line direct mode operation and aims to realize voice communication between users in a base station-free area, and switching of voice communication between the users. A voice communication method comprises the following steps that a session initiation user monitors a physical shared channel (PSCH), finds an idle continuous bandwidth, and sends preface information to a physical random access channel (PRACH); a session receiving user receives the information and decodes the information synchronously, and then replies session confirmation information; the session initiation user receives the session confirmation information sent by the session receiving user and establishes voice communication between the session initiation user and the session receiving user; and a method for switching the voice communication between the users comprises the following steps that the session receiving user judges the priority level of a new session initiation user and the session initiation user, selects the user with the higher priority level and performs voice communication with the user with the higher priority level. The method is suitable for point-to-point off-line direct mode operation under the public network TD-LTE.
Description
technical field [0001] The invention relates to an off-network direct communication method. Background technique [0002] Currently, communication between multiple users relies on base stations for signal transmission. However, the following communications (quasi-duplex) are currently not possible in an area without base stations: [0003] 1. Voice calls between users; 2: Switching of user voice calls (for the priority of the user who dials him). Contents of the invention [0004] The present invention aims to realize the voice call between users and the switching of the user's voice call in an area without a base station, thereby providing a point-to-point off-network direct communication method under the public network TD-LTE. [0005] A point-to-point off-network direct communication method under public network TD-LTE, [0006] Its voice call method between the user who initiates the session and the user who receives the session is realized by the following steps: ...
Claims
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