TERMINAL IN DIGITAL MOBILE RADIO RELAY SYSTEM, TRANSMISSION POWER REGULATION METHOD AND SYSTEM THEREOF

• US 20130100878A1
• Filed: 07/05/2010
• Published: 04/25/2013
• Est. Priority Date: 07/05/2010
• Status: Active Grant

• Current Assignee: Hytera Communications Corp. Ltd.
• Original Assignee: Hytera Communications Corp. Ltd.
• Inventors: Samuel, Chiahan Siong, Chen, Mingjun
• Granted Patent: US 8,942,159 B2
• Time in Patent Office: Days
• US Class Current: 370/315
• CPC Class Codes: H04B 17/318 Received signal strength
• CPC Class Codes: H04W 52/0245 according to signal strength
• CPC Class Codes: H04W 52/04 TPC
• CPC Class Codes: H04W 52/228 using past power values or information
• CPC Class Codes: H04W 52/242 taking into account path loss
• CPC Class Codes: H04W 52/245 taking into account received signal strength
• CPC Class Codes: H04W 52/287 when the channel is in stand-by
• CPC Class Codes: H04W 52/46 in multi hop networks, e.g. wireless relay networks
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

A terminal in a digital mobile radio relay system, a transmission power regulation method and a system thereof are provided. The method includes that an idle frame sent from a relay station is received, the idle frame carries transmission power information of the relay station (201); the transmission power of the relay station is obtained according to the information in the idle frame (202); after a transmission state is entered, data is transmitted in assigned transmission time slots (203); a signal of the relay station is received via a reversal channel and a strength value of the received signal is calculated (204); when data transmission is required to be continued, the transmission power of a next frame is determined based on the transmission power of the relay station and the strength value of the received signal (206); according to the determined transmission power of the next frame, the data of next frame is transmitted in assigned transmission time slots.

Claims

1. A method for adjusting a transmission power of a terminal in a digital mobile radio relay system, comprising:

receiving an idle frame transmitted by a repeater transeiver, wherein information of a transmission power of the repeater transeiver is carried in the idle frame;

obtaining the transmission power of the repeater transeiver from the information carried in the idle frame;

transmitting data in a preset transmission time slot, after entering a transmitting state;

receiving a signal from the repeater transeiver in a reverse channel and calculating a strength value of the received signal;

determining a transmission power of a next frame based on the transmission power of the repeater transeiver and the strength value of the received signal, in the case that data is to be continuously transmitted; and

transmitting the next frame in a preset transmission time slot by using the determined transmission power of the next frame.

2. The method according to claim 1, further comprising:

activating the repeater transeiver in the case that the repeater transeiver is in a dormancy state.

3. The method according to claim 1, wherein the receiving an idle frame transmitted by a repeater transeiver comprises:

receiving the idle frame transmitted by the repeater transeiver in a preset transmission time slot;

or

receiving the idle frame transmitted by the repeater transeiver in a time slot other than the preset transmission time slot.

4. The method according to claim 1, wherein the determining a transmission power of a next frame based on the transmission power of the repeater transeiver and the strength value of the received signal comprises:

determining the transmission power of the next frame based on a condition, wherein the condition comprises;

the strength value of the received signal being equal to a difference between the transmission power of the repeater transceiver and a transmission loss of a link from the repeater transeiver to the terminal; and

the difference between the transmission power of the next frame and the transmission loss of a link from the terminal to the repeater transeiver being larger than a reception sensitivity of the repeater transeiver.

5. The method according to claim 4, further comprising:

performing a fading compensation for the strength value of the received signal, before the step of determining a transmission power of a next frame based on the transmission power of the repeater transeiver and the strength value of the received signal.

6. The method according claim 1, further comprising:

determining whether the transmission power is to be adjusted, before the step of determining a transmission power of a next frame based on the transmission power of the repeater transeiver and the strength value of the received signal;

performing the step of determining a transmission power of a next frame based on the transmission power of the repeater transeiver and the strength value of the received signal, if the transmission power is to be adjusted; and

transmitting a next frame in a preset transmission time slot by using a transmission power of a current frame, if the transmission power is not to be adjusted.

7. The method according to claim 6, wherein the determining whether the transmission power is to be adjusted comprises:

deciding that the transmission power is to be adjusted, if an impolite access is required and the idle frame transmitted by the repeater transeiver is not received before the terminal enters the transmitting state;

or

deciding that the transmission power is not to be adjusted, if a power dynamic adjustment function is not started by a customer.

8. A terminal in a digital mobile radio relay system, comprising:

a first receiving unit adapted to receive an idle frame transmitted by a repeater transeiver, wherein information of a transmission power of the repeater transeiver is carried in the idle frame;

a power obtaining unit adapted to obtain the transmission power of the repeater transeiver from the information carried in the idle frame;

a transmitting unit adapted to transmit data in a preset transmission time slot after entering a transmitting state is entered;

a second receiving unit adapted to receive a signal from the repeater transeiver in a reverse channel and calculate a strength value of the received signal; and

a calculating unit adapted to determine a transmission power of a next frame based on the transmission power of the repeater transeiver and the strength value of the received signal, in the case that data is to be continuously transmitted by the transmitting unit,

wherein the transmitting unit is further adapted to transmit the next frame in a preset transmission time slot by using the transmission power of the next frame determined by the calculating unit.

9. The terminal according to claim 8, further comprising:

an activating unit adapted to activate the repeater transeiver in the case that the repeater transeiver is in a dormancy state.

10. The terminal according to claim 8, wherein

the first receiving unit is adapted to receive the idle frame transmitted by the repeater transeiver in the preset transmission time slot;

or receiving the idle frame transmitted by the repeater transeiver in a time slot other than the preset transmission time slot.

11. The terminal according to claim 8, wherein

the calculating unit is adapted to determine the transmission power of the next frame based on a condition, wherein the condition comprises:

the strength value of the received signal being equal to a difference between the transmission power of the repeater transeiver and a transmission loss of a link from the repeater transeiver to the terminal; and

a difference between the transmission power of the next frame and the transmission loss of a link from the terminal to the repeater transeiver being larger than a reception sensitivity of the repeater transeiver.

12. The terminal according to claim 11, further comprising:

a compensating unit adapted to perform a fading compensation for the strength value of the received signal calculated by the second receiving unit, before the transmission power of the next frame is determined by the calculating unit based on the transmission power of the repeater transeiver and the strength value of the received signal.

13. The terminal according to claim 8, further comprising:

a determining unit adapted to determine whether the transmission power is to be adjusted, before the transmission power of the next frame is determined by the calculating unit based on the transmission power of the repeater transeiver and the strength value of the received signal;

notify the calculating unit to determine the transmission power of the next frame based on the transmission power of the repeater transeiver and the strength value of the received signal, if the transmission power is to be adjusted; and

notify the transmitting unit to transmit the next frame in a preset transmission time slot by using a transmission power of a current frame, if the transmission power is not to be adjusted.

14. The terminal according to claim 13, wherein the determining unit is adapted to determine whether the transmission power is to be adjusted in accordance with a rule, wherein the rule comprises:

if an impolite access is required and the idle frame transmitted by the repeater transeiver is not received by the first receiving unit before the terminal enters the transmitting state, deciding that the transmission power is to be adjusted;

or

deciding that the transmission power is not to be adjusted, if a power dynamic adjustment function is not started by a customer.

15. A system for adjusting a transmission power of a terminal in a digital mobile radio relay system, comprising a terminal and a repeater transeiver, wherein

the repeater transeiver is adapted to transmit an idle frame, wherein information of a transmission power of the repeater transeiver is carried in the idle frame;

and

the terminal is adapted to receive the idle frame transmitted by the repeater transeiver;

obtain the transmission power of the repeater transeiver from the information carried in the idle frame;

transmit data in a preset transmission time slot after entering a transmitting state;

receive a signal from the repeater transeiver in a reverse channel and calculate a strength value of the received signal;

determine a transmission power of a next frame based on the transmission power of the repeater transeiver and the strength value of the received signal, in the case that data is to be continuously transmitted; and

transmit the next frame of data in a preset transmission time slot by using the determined transmission power of the next frame.