GB2556844A

GB2556844A - Random access repeater, relay system and relay method therefor

Info

Publication number: GB2556844A
Application number: GB1804967.6A
Authority: GB
Inventors: Li Zhuoqun
Original assignee: Xiamen Zongxing Information Tech Co Ltd
Current assignee: Xiamen Zongxing Information Tech Co Ltd
Priority date: 2015-08-31
Filing date: 2016-08-24
Publication date: 2018-06-06
Anticipated expiration: 2036-08-24
Also published as: JP2018535565A; GB201804967D0; CN105357744B; JP6675422B2; WO2017036327A1; CN105357744A; GB2556844B

Abstract

Disclosed are a random access repeater, a relay system and a relay method therefor. The method comprises: a repeater sending a broadcast signal; a terminal receiving the broadcast signal; the terminal sending, in a random access time window of the repeater, a message to the repeater; and the repeater sending a confirmation message to the terminal after successfully receiving the message and successfully forwarding same. The coverage range expansion and large-scale networking of a low rate wireless communication network are supported by a wireless repeater in the present application. A repeater does not need to schedule the communication of the terminal, and only needs to be dormant periodically according to a certain rule. A large number of terminals can automatically adjust the sending time of an uplink message, such as an event trigger signal, according to a dormant period of the repeater, so as to ensure that the message can be received and forwarded by the repeater, and is finally received by a base station.

Description

(56) Documents Cited:

CN 105357744 A CN 101981894 A

CN 102934399 A CN 001909516 A (32) 31.08.2015 (33) CN (58) Field of Search:

INT CL H04L, H04Q, H04W (86) International Application Data:

PCT/CN2016/096477 Zh 24.08.2016 (87) International Publication Data:

WO2017/036327 Zh 09.03.2017 (71) Applicant(s):

Xiamen Zongxing Information Technology Co Ltd (Incorporated in China)

Room 304, Fenglinmei Office Building,

No. 90 Tongji South Road, Jimei District, Xiamen, Fujian, 361021, China (72) Inventor(s):

Zhuoqun Li (74) Agent and/or Address for Service:

Urquhart-Dykes & Lord LLP

Arena Point, Merrion Way, LEEDS, LS2 8PA,

United Kingdom (54) Title of the Invention: Random access repeater, relay system and relay method therefor Abstract Title: Random access repeater, relay system and relay method therefor (57) Disclosed are a random access repeater, a relay system and a relay method therefor. The method comprises: a repeater sending a broadcast signal; a terminal receiving the broadcast signal; the terminal sending, in a random access time window of the repeater, a message to the repeater; and the repeater sending a confirmation message to the terminal after successfully receiving the message and successfully forwarding same. The coverage range expansion and large-scale networking of a low rate wireless communication network are supported by a wireless repeater in the present application. A repeater does not need to schedule the communication of the terminal, and only needs to be dormant periodically according to a certain rule. A large number of terminals can automatically adjust the sending time of an uplink message, such as an event trigger signal, according to a dormant period of the repeater, so as to ensure that the message can be received and forwarded by the repeater, and is finally received by a base station.

301 WIRELESS TRANSCEIVER

302 CONTROLLER

1/3

FIG.1

FIG.2

2/3

SI

FIG.3

FIG.4

3/3

II

Random access time window

Broadcasting synchronization signal

Sleep time

II

Broadcasting synchronization signal

FIG. 5

A random access relay, a relay system and a method of randomly accessing a relay [0001] Cross-reference of the related application [0002] This application is based on the Chinese patent application with application number 201510542454X and application date Aug 31^st, 2015, and claims the priority of its Chinese patent application, whose entire content is cited in this application.

Technical field [0003] The present invention relates to communication field, particularly to a low power random access relay, a relay system and a method of randomly accessing a relay.

Related art [0004] Internet of things, or namely sensor network, transmits the message by relays to wider the network coverage. Each message transmitting by a relay is called one jump. However, traditional relays have their limitation in the practical application.

[0005] Particularly, to keep the connection with the downstream joint, the traditional relay is always kept in a high power receiving state. But in the practical application, due to the implement environment, the relays must be powered by batteries. If the relays of keeping in receiving state are powered by batteries, the batteries run out quickly that shortens the service life of the network, leading to high maintenance cost.

[0006] To save power, there is a design that the relay distributes a slot time to each downstream joint in demand of transmitting message. The relay works in high power receiving state in the distributed slot times and sleeps in other times.

[0007] In the practical application, the demand of transmitting message of some downstream joint is triggered by events, resulting in difficulty of predicting in advance. The power is wasted if the relay reserves slot time for the downstream joints. In a situation of a large amount of downstream joints, the reserving slot times occupy the sleep time of the relay. But if the relay doesn’t reserve slot times for the downstream joints, when the joints are triggered by specific events, and generates and transmits message to the relay for transmitting, the relay may be in sleep state and thus can not be awaken to receive the massages, leading to an unstable communication network.

[0008] Summary of the invention [0009] The object of present invention is to overcome the disadvantages of the existing known technology and to provide with a networking method of mixing networks to wider the coverage and widely network of low bitrate wireless communication networks supported by relays. The wireless relays needn’t to dispatch the communication with the terminal, but sleep in cycles according in certain rules. A large amount of terminal can automatically adjust the transmission time of the upstream message (an event trigger signal for example) according to the sleep cycles of the relays, and the message is guaranteed to be received and transmitted by the relays and finally be received by the base station. The relays just receive and transmit the massage or the messages from the terminals, but not dispatch the transmitting time of the massage or the slot time.

[0010] The technical solution of the present invention is that:

[0011] A method of randomly accessing a relay, comprising the steps: a relay broadcasts a signal; a terminal receives the broadcast signal; the terminal transmits message to the relay in a random access time window of the relay; the relay sends a confirmation massage to the terminal after receiving the massage and transmitting the message.

[0012] In another preferred embodiment, the relay pre-determines its working cycle and broadcasting cycle.

[0013] In another preferred embodiment, one working cycle comprises a sleep time and a random access time window; the relay is in sleeping state or low power working state in the sleep time, and the relay receives and transmits the message in the random access time window.

[0014] In another preferred embodiment, one broadcasting cycle comprises a broadcasting time and an idle time; the relay broadcasts signal in the broadcasting time and does not broadcast in the idle time.

[0015] In another preferred embodiment, the working cycle of the relay is determined by the relay according to a certain rule or is set by a configuration instruction of an upstream base station.

[0016] In another preferred embodiment, the broadcasting cycle of the relay is determined by the relay according to a certain rule or is set by a configuration instruction of an upstream base station.

[0017] In another preferred embodiment, the working cycle and the broadcasting cycle have different cycles.

[0018] In another preferred embodiment, the broadcast signal carries synchronization information, the terminal can judge the start time of the next random access time window of the relay based on the synchronization information.

[0019] In another preferred embodiment, after the terminal receives the broadcast signal, the terminal adjusts its clock to synchronize the counter of the relay, and judges the time of the relay to finish the sleeping state or low power working state and the start time of the random access time window according to the known working cycle of the relay.

[0020] In another preferred embodiment, the terminal transmits message to the relay at the start time of the random access time window of the working cycle.

[0021] In another preferred embodiment, the relay transmits the message or the messages received to the upstream base station or another relay immediately.

[0022] In another preferred embodiment, the relay transmits the message or the messages received when the random access time window of the upstream base station or another relay comes.

[0023] In another preferred embodiment, the relay transmits the message or the messages received when a preset access slot time comes according to a slot time dispatch of the upstream base station or another relay.

[0024] The present invention further provides with a random access relay, which comprises:

[0025] a wireless transceiver, the wireless transceiver transmits a broadcast signal according to a certain broadcasting cycle, receives a message from a terminal and transmits the message;

[0026] a controller, the controller determines its and the wireless transceiver’s working cycles and broadcasting cycles, and controls the transceiving of the wireless transceiver in a random time window.

[0027] In another preferred embodiment, the relay comprises at least two wireless transceivers; the wireless transceivers and their controllers directly transmit the message via a wired data interface or a control signal interface, or the wireless transceivers transmit the message indirectly via a controller. [0028] In another preferred embodiment, the more than two wireless transceivers and their controllers synchronize the clock via a clock signal interface or the control signal interface; the clock synchronization comprises clock frequency synchronization or clock phase synchronization.

[0029] In another preferred embodiment, every wireless transceiver and its controller have their sleepy or awaken independent from the other wireless transceivers and controllers, and awake other wireless transceivers and controllers by an external control signal via the control signal interface.

[0030] In another preferred embodiment, one working cycle comprises a sleep time and a random access time window; the wireless transceiver and its controller are in sleeping state or low power working state in the sleep time, and work in the random access time window.

[0031] In another preferred embodiment, one broadcasting cycle comprises a broadcasting time and an idle time; the controller controls the wireless transceiver to transmit broadcast signal in the transmitting time and not transmit in the idle time.

[0032] In another preferred embodiment, the working cycle is determined by the controller according to a certain rule or is set by a configuration instruction of an upstream base station.

[0033] In another preferred embodiment, the broadcasting cycle is determined by the controller according to a certain rule or is set by a configuration instruction of an upstream base station.

[0034] In another preferred embodiment, the broadcasting cycle is determined by the controller according to a certain rule or is set by a configuration instruction of an upstream base station.

[0035] In another preferred embodiment, the working cycle and the broadcasting cycle have different cycles.

[0036] In another preferred embodiment, the broadcast signal carries synchronization information, the terminal can judge the start time of the next random access time window of the relay based on the synchronization information.

[0037] In another preferred embodiment, the wireless transceiver transmits the message or the messages received to the upstream base station or another relay immediately.

[0038] In another preferred embodiment, the wireless transceiver transmits the message or the messages received when the random access time window of the upstream base station or another relay comes.

[0039] In another preferred embodiment, the wireless transceiver transmits the message or the messages received when a preset access slot time comes according to a slot time dispatch of the upstream base station or another relay. [0040] The present invention further provides with a random access relay system, comprising the relay above mentioned and a terminal; the terminal receives the broadcast signal from the relay, and transmits the message to the relay in the random access time window of the relay.

[0041] In another preferred embodiment, one working cycle comprises a sleep time and a random access time window; the wireless transceiver and its controller are in sleeping state or low power working state in the sleep time, and work in the random access time window.

[0042] In another preferred embodiment, one broadcasting cycle comprises a broadcasting time and an idle time; the controller controls the wireless transceiver to transmit broadcast signal in the transmitting time and not transmit in the idle time.

[0043] In another preferred embodiment, the working cycle is determined by the controller according to a certain rule or is set by a configuration instruction of an upstream base station.

[0044] In another preferred embodiment, the broadcasting cycle is determined by the controller according to a certain rule or is set by a configuration instruction of an upstream base station.

[0045] In another preferred embodiment, the broadcasting cycle is determined by the controller according to a certain rule or is set by a configuration instruction of an upstream base station.

[0046] In another preferred embodiment, the working cycle and the broadcasting cycle have different cycles.

[0047] In another preferred embodiment, the broadcast signal carries synchronization information, the terminal can judge the start time of the next random access time window of the relay based on the synchronization information.

[0048] In another preferred embodiment, the wireless transceiver transmits the message or the messages received to the upstream base station or another relay immediately.

[0049] In another preferred embodiment, the wireless transceiver transmits the message or the messages received when the random access time window of the upstream base station or another relay comes.

[0050] In another preferred embodiment, the wireless transceiver transmits the message or the messages received when a preset access slot time comes according to a slot time dispatch of the upstream base station or another relay. [0051] in another preferred embodiment, after the terminal receives the broadcast signal, the terminal adjusts its clock to synchronize the counter of the relay, and judges the time of the relay to finish the sleeping state or low power working state and the start time of the random access time window according to the known working cycle of the relay.

[0052] In another preferred embodiment, the terminal transmits message to the relay in the random access time window of the working cycle.

[0053] The present invention has advantages as follows: the working cycle of the relay is divided, and the relay broadcasts, the entire network can be intelligently switched. The network dispatch is optimized, the power consumption of the network is reduced, and the stability ofthe network communication is improved.

[0054] The present invention will be further described with the drawings and the embodiments; but it should be noted that, the scope ofthe present invention is not limited to the embodiments.

Brief description of the drawings [0055] To clearly describe the technical solution of the embodiment of the present invention or the related art, the drawings will be brief described. Obviously, although the drawings only describe some embodiments of this application, other drawings can be obtained by a person skilled in this field. [0056] FIG.1 illustrates a schematic diagram of a random access relay system of the present invention.

[0057] FIG.2 illustrates a schematic diagram of another random access relay system.

[0058] FIG.3 illustrates a schematic diagram of another random access relay with a wireless transceiver and controller.

[0059] FIG.4 illustrates a flow diagram of a method of randomly accessing a relay of the present invention.

[0060] FIG.5 illustrates a schematic diagram of the working cycle and the broadcasting cycle.

Detailed description ofthe embodiments [0061] To clearly describe the technical solution of the embodiment of the present invention, the embodiments ofthe present invention will be clearly and completely described combining the drawings. Obviously, the following described embodiments are only a part of embodiments of the present invention, and the rest embodiments a person skilled in this field obtains are within the scope of the present invention.

[0062] The implement of the present invention will be further described with the drawings.

[0063] Referring to FIG.1, the present invention provides with a random access relay system, which comprises a base station 101, a random access relay 102 and terminals 103.

[0064] The base station 101 establishes a connection with the random relay 102 in the network; the random relay 102 can establish a connection with one terminal or a plurality of terminals 103; the random access relay 102 receives the message of the terminal 103 just when the random access time window comes, then transmits to the base station 101. The terminal 103 receives the broadcast signal ofthe random access relay 102, and transmits the message to the random access relay 102 in the random access time window ofthe relay. [0065] Referring to FIG.2, provided is a networking method with random access relay. The random access relay system comprises three logical joints: a base station 201, a plurality of random access relays and a plurality of terminals 204. This drawing differs from FIG.1 in that: the system comprises a plurality of random access relays.

[0066] The base station 201 establishes a connection with the random relay 202 in the network; the random relay 202 can establish a connection with another random access relay; the random relay 203 can establish a connection with one terminal or a plurality of terminals 204; the random access relay 203 receives the message of the terminal 204 just when the random access time window comes, then transmits to the upstream random access relay. The random access relay 203 has three kinds of transmitting methods after it successfully receives a message or messages:

[0067] The first is that the relay transmits the message or the messages received when the random access time window of the upstream base station or another relay comes.

[0068] The second is that the relay transmits the message or the messages received when a preset access slot time comes according to a slot time dispatch of the upstream base station or another relay.

[0069] The third is that the relay transmits the message or the messages received to the upstream base station or another relay immediately.

[0070] Combined with FIG.3, the random access relay figured in FIG.1 and FIG.3 will be further described.

[0071] Referring to FIG.3, a random access relay to implement above relaying system comprises a wireless transceiver 301 and a controller 302.

[0072] The wireless transceiver 301 is used for the terminal, the base station and another random access relay to transceiver a signal. The wireless transceiver 301 is controiied by the controller 302 to broadcast signal according to a determined broadcasting cycle and receive the message from the terminal in the random access time window, the transceiver 301 then transmits the message and works in a sleep or low power state in the sleep time.

[0073] The controller 302 determines the working cycle and broadcasting cycle of the transceivers 301 and its controller, controls the transceiving of the wireless transceiver in the random time window, and processes the message from/to the terminal.

[0074] Another kind of random access relay comprises a wireless transceiver 401, a controller 402, a second controller 403 and a second wireless transceiver 404.

[0075] The wireless transceiver 401 broadcasts according to the determined broadcasting cycle, receives and transmits the message from the terminal. [0076] The controller 402 determines the working cycle and broadcasting cycle of the transceivers and its controller, controls the transceiving of the wireless transceiver in the random time window, and processes the message from/to the terminal.

[0077] Above mention working cycle comprises a sleep time and a random access time window; the wireless transceiver and its controller are in sleeping state or low power working state in the sleep time, the wireless transceiver receives and transmits the message in the random access time window. One broadcasting cycle comprises a broadcasting time and an idle time; the wireless transceiver transmits broadcast signal in the transmitting time and does not transmit in the idle time.

[0078] The wireless transceiver 404 is used for the base station or another random access relay to transceiver a wireless signal.

[0079] The controller 302 controlling the working state of the wireless transceiver 404 comprises awaking another random access relay from the sleep state at the start time of the random access time window and processing the message from/to the base station or the message of another random access relay.

[0080] A person skilled in this field known that above mentioned is for description only. In practice, a relay can integrate a plurality of communicated and cooperated wireless transceivers and their controllers.

[0081] The more than two wireless transceivers and their controllers can directly transmit the message via a wired data interface or a control signal interface, or the wireless transceivers transmit the message indirectly via a controller.

[0082] Furthermore, the more than two wireless transceivers and their controllers synchronize the clock via a clock signal interface or the control signal interface; the clock synchronization comprises clock frequency synchronization or clock phase synchronization.

[0083] Or in another case, every wireless transceiver and its controller have their sleepy or awaken independent from the other wireless transceivers and controllers, and awake other wireless transceivers and controllers by an external control signal via the control signal interface.

[0084] The wireless transceiver can use following three methods to transmit the message or the messages after it receives:

[0085] The first is that the wireless transceiver transmits the message or the messages received to the upstream base station or another relay immediately. [0086] The second is that the wireless transceiver transmits the message or the messages received when the random access time window of the upstream base station or another relay comes.

[0087] The third is that the wireless transceiver transmits the message or the messages received when a preset access slot time comes according to a slot time dispatch ofthe upstream base station or another relay.

[0088] The structure of the random access relay is above described combining FIG.3. The working process ofthe random access relay will be described combining FIG.4 and FIG.5.

[0089] As figured in FIG.4, the method comprises the steps:

[0090] Step S1, the relay broadcasts.

[0091] The relay pre-determines its working cycle and broadcasting cycle, one working cycle comprises a sleep time and a random access time window; the relay is in sleeping state or low power working state in the sleep time, and the relay receives messages and transmits the message in the random access time window. One broadcasting cycle comprises a broadcasting time and an idle time; the relay broadcasts signal in the broadcasting time and does not broadcast in the idle time. Therein, FIG.5 illustrates the working cycle and the broadcasting cycle ofthe relay. Therein, broadcasting the synchronization signal is in the broadcasting time, from the end of this broadcasting time to the next broadcasting time is the idle time.

[0092] The working cycle and the broadcasting cycle of the relay is determined by the relay according to a certain rule or is set by a configuration instruction of an upstream base station. And the working cycle and the broadcasting cycle have different cycles.

[0093] The working cycle and the broadcasting cycle can be configured flexibly by the power consumption ofthe relay, the demand to the service life of the battery, the technical index ofthe crystal oscillator ofthe terminal, etc. A common configured principle is that the higher the demand to the service life of the battery is, the longer the sleep time of the working cycle is; the worse the technical index of the crystal oscillator is, the shorter the broadcasting cycle is, namely the higher the broadcasting frequency is. The broadcast signal carries synchronization information, or the clock information ofthe relay or the both. The terminal can judge the start time of the next random access time window ofthe relay based on the synchronization information.

[0094] Step S2, the terminal receives the broadcast signal.

[0095] The terminal receives the broadcast signal, then the terminal adjusts its clock to synchronize the counter of the relay according to the synchronization information or the clock information ofthe broadcast signal, and judges the time of the relay to finish the sleeping state or low power working state and the start time of the random access time window according to the known working cycle of the relay.

[0096] Step S3, the terminal transmits message to the relay in a random access time window of the relay.

[0097] Once an event triggers and the terminal needs to transmit massage to the relay, the terminal transmits the message to the relay in the random access time window.

[0098] Step S4, the relay sends a confirmation massage to the terminal after receiving the massage and transmitting the message.

[0099] There are three transmitting method after the relay successfully receives a message or messages:

[00100] The first is that the relay transmits the message or the messages received when the random access time window of the upstream base station or another relay comes.

[00101] The second is that the relay transmits the message or the messages received when a preset access slot time comes according to a slot time dispatch of the upstream base station or another relay.

[00102] The third is that the relay transmits the message or the messages received to the upstream base station or another relay immediately.

[00103]The relay sends a confirmation massage to the terminal after successfully transmitting the message.

[00104] The terminal judges that the message is transmitted successfully after it receives the confirmation message. If the terminal has waited a preset period or it receives a failure message, it retransmits the message in a random access time window or transmits the message to another relay.

[00105] Although the present invention has been described with reference to the preferred embodiments thereof for carrying out the patent for invention, it is apparent to those skilled in the art that a variety of modifications and changes may be made without departing from the scope of the patent for invention which is intended to be defined by the appended claims.

io

Claims

Claims [claim 1] A method of randomly accessing a relay, wherein comprising the steps: a relay broadcasts a signal; a terminal receives the broadcast signal; the terminal transmits message to the relay in a random access time window of the relay; the relay sends a confirmation massage to the terminal after receiving the massage and transmitting the message.

[claim 2] The method according to claim 1, wherein the relay pre-determines its working cycle and broadcasting cycle.

[claim 3] The method according to claim 2, wherein one working cycle comprises a sleep time and a random access time window; the relay is in sleeping state or low power working state in the sleep time, and the relay receives and transmits the message in the random access time window.

[claim 4] The method according to claim 2, wherein one broadcasting cycle comprises a broadcasting time and an idle time; the relay broadcasts signal in the broadcasting time and does not broadcast in the idle time.

[claim 5] The method according to claim 2, wherein the working cycle of the relay is determined by the relay according to a certain rule or is set by a configuration instruction of an upstream base station.

[claim 6] The method according to claim 2, wherein the broadcasting cycle ofthe relay is determined by the relay according to a certain rule or is set by a configuration instruction of an upstream base station.

[claim 7] The method according to claim 2, wherein the working cycle and the broadcasting cycle have different cycles.

[claim 8] The method according to any of claims 1-7, wherein the broadcast signal carries synchronization information, the terminal can judge the start time of the next random access time window of the relay based on the synchronization information.

[claim 9] The method according to any of claims 1-7, wherein after the terminal receives the broadcast signal, the terminal adjusts its clock to synchronize the counter of the relay, and judges the time of the relay to finish the sleeping state or low power working state and the start time of the random access time window according to the known working cycle of the relay.

[claim 10] The method according to claim 9, wherein the terminal transmits message to the relay at the start time of the random access time window of the working cycle.

[claim 11] The method according to any of claims 1-7, wherein the relay transmits the message or the messages received to the upstream base station or another relay immediately.

[claim 12] The method according to any of claims 1-7, wherein the relay transmits the message or the messages received when the random access time window of the upstream base station or another relay comes.

[claim 13] The method according to any of claims 1-7, wherein the relay transmits the message or the messages received when a preset access slot time comes according to a slot time dispatch of the upstream base station or another relay.

[claim 14] The random access relay, wherein comprising a wireless transceiver and a controller; the wireless transceiver transmits a broadcast signal according to a certain broadcasting cycle, receives a message from a terminal and transmits the message; the controller determines its and the wireless transceiver’s working cycles and broadcasting cycles, and controls the transceiving of the wireless transceiver in a random time window.

[claim 15] The random access relay according to claim 14, wherein the relay comprises at least two wireless transceivers; the wireless transceivers and their controllers directly transmit the message via a wired data interface or a control signal interface, or the wireless transceivers transmit the message indirectly via a controller.

[claim 16] The random access relay according to claim 15, wherein the more than two wireless transceivers and their controllers synchronize the clock via a clock signal interface or the control signal interface; the clock synchronization comprises clock frequency synchronization or clock phase synchronization.

[claim 17] The random access relay according to claim 15, wherein every wireless transceiver and its controller have their sleepy or awaken independent from the other wireless transceivers and controllers, and awake other wireless transceivers and controllers by an external control signal via the control signal interface.

[claim 18] The random access relay according to any of claims 14-17 wherein one working cycle comprises a sleep time and a random access time window; the wireless transceiver and its controller are in sleeping state or low power working state in the sleep time, and work in the random access time window.

[claim 19] The random access relay according to any of claims 14-17, wherein one broadcasting cycle comprises a broadcasting time and an idle time; the controller controls the wireless transceiver to transmit broadcast signal in the transmitting time and not transmit in the idle time.

[claim 20] The random access relay according to any of claims 14-17, wherein the working cycle is determined by the controller according to a certain rule or is set by a configuration instruction of an upstream base station.

[claim 21] The random access relay according to any of claims 14-17, wherein the broadcasting cycle is determined by the controller according to a certain rule or is set by a configuration instruction of an upstream base station.

[claim 22] The random access relay according to any of claims 14-17, wherein the broadcasting cycle is determined by the controller according to a certain rule or is set by a configuration instruction of an upstream base station.

[claim 23] The random access relay according to any of claims 14-17, wherein the working cycle and the broadcasting cycle have different cycles.

[claim 24] The random access relay according to any of claims 14-17, wherein the broadcast signal carries synchronization information, the terminal can judge the start time of the next random access time window of the relay based on the synchronization information.

[claim 25] The random access relay according to any of claims 14-17, wherein the wireless transceiver transmits the message or the messages received to the upstream base station or another relay immediately.

[claim 26] The random access relay according to any of claims 14-17, wherein the wireless transceiver transmits the message or the messages received when the random access time window of the upstream base station or another relay comes.

[claim 27] The random access relay according to any of claims 14-17, wherein the wireless transceiver transmits the message or the messages received when a preset access slot time comes according to a slot time dispatch of the upstream base station or another relay.

[claim 28] A random access relay system, comprising the relay according to any of claims 14-17 and a terminal; the terminal receives the broadcast signal from the relay, and transmits the message to the relay in the random access time window of the relay.

[claim 29] The relay system according to claim 28, wherein one working cycle comprises a sleep time and a random access time window; the wireless transceiver and its controller are in sleeping state or low power working state in the sleep time, and work in the random access time window.

[claim 30] The relay system according to claim 28, wherein one broadcasting cycle comprises a broadcasting time and an idle time; the controller controls the wireless transceiver to transmit broadcast signal in the transmitting time and not transmit in the idle time.

[claim 31] The relay system according to claim 28, wherein the working cycle is determined by the controller according to a certain rule.

[claim 32] The relay system according to claim 28, wherein the broadcasting cycle is determined by the controller according to a certain rule.

[claim 33] The relay system according to claim 28, wherein the broadcasting cycle is set by a configuration instruction of an upstream base station.

[claim 34] The relay system according to claim 28, wherein the working cycle and the broadcasting cycle have different cycles.

[claim 35] The relay system according to claim 28, wherein the broadcast signal carries synchronization information.

[claim 36] The relay system according to claim 28, wherein the wireless transceiver transmits the message or the messages received to the upstream base station or another relay immediately.

[claim 37] The relay system according to claim 28, wherein the wireless transceiver transmits the message or the messages received when the random access time window of the upstream base station or another relay comes.

[claim 38] The relay system according to claim 28, wherein the working cycle is set by a configuration instruction of an upstream base station.

[claim 39] The relay system according to claim 35, wherein the terminal can judge the start time of the next random access time window of the relay based on the synchronization information.

[claim 40] The relay system according to claim 28, wherein the wireless transceiver transmits the message or the messages received when a preset access slot time comes according to a slot time dispatch of the upstream base station or another relay.

[claim 41] The relay system according to claim 28, wherein after the terminal receives the broadcast signal, the terminal adjusts its clock to synchronize the counter of the relay, and judges the time of the relay to finish the sleeping state or low power working state and the start time of the random access time window according to the known working cycle of the relay.

[claim 42] The relay system according to claim 28, wherein the terminal transmits message to the relay in the random access time window of the working cycle.