Random access method based on single carrier TDMA and base station

Abstract

The embodiment of the invention provides a random access method based on a signal carrier TDMA and a base station. According to the method, networking is conducted based on a single carrier and TDMA access mode. A physical layer frame of the method comprises TDD wireless frames, the length of each TDD wireless frame is 10 ms, each TDD wireless frame comprises 10 time slots, and four continuous TDD wireless frames constitute a multi-frame, wherein the front two time slots and the later eight time slots of each TDD wireless frame are used as a carrier of a control channel and a carrier of a traffic channel respectively. The control channel comprises a broadcast control channel BCCH, a random access channel RACH, an access granted channel AGCH, a paging channel PCH, a dedicated control channel DCCH and a frequency correction channel FCCH, wherein an RACH time slot comprises a plurality of RACH sub time slots. According to the random access method based on the signal carrier, access time delay can be shortened, and the access capacity, the access speed and the transmission speed can be increased.

Description

technical field [0001] The present application relates to the technical field of time division multiple access (TDMA, time division multiple access), in particular to a random access method based on single-carrier TDMA and a base station. Background technique [0002] The random access process is an important process in the wireless communication system and an important link in the wireless access process. In the TDMA system, one of the third-generation mobile communication systems, the random access process includes important uplink synchronization process. The TDMA system is based on time-division duplex technology, which uses different time slots on the same frequency channel to receive and transmit data. [0003] When applied to a Global System of Mobile communication (GSM, Global System of Mobile communication) system, the TDMA system performs random access according to the GSM protocol. However, each random access channel (RACH, Random Access Channel) in the GSM prot...

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Problems solved by technology

However, each random access channel (RACH, Random Access Channel) in the GSM protocol can only guarantee that one terminal successfully initiates random access; and, for a single terminal, the sending timing of the channel request message sequence is not arbitrary, and needs to be Common Control Channel (CCCH, Common Control Channel) block is sent at the corresponding time, and the CCCH block is the CCCH corresponding to the paging group (PAGING GROUP) to which it belongs. Generally speaking, the number of PAGING GROUP in a GSM cell is About 10, so for a single terminal, it needs to wait for 10 GSM TDMA frames on average to initiate random access, that is, currently a single terminal needs to spend 46.15ms to complete random access

[0004] In summary, the current random access scheme based on TDMA has the disadvantage of prolonging the access time

Moreover, it can only guarantee the access of one terminal at the same time

In addition, it uses GSM narrowband signals (single carrier frequency bandwidth is 200k), so it has the disadvantages of low access rate and low transmission rate

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