Method for implementing system information broadcating function in asynchronous mobile communication system

• US 20020065091A1
• Filed: 10/12/2001
• Published: 05/30/2002
• Est. Priority Date: 10/14/2000
• Status: Active Grant

• Current Assignee: Optis Cellular Technology LLC (Brevet Capital)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Choi, Yun Ju
• Granted Patent: US 7,116,648 B2
• Time in Patent Office: Days
• US Class Current: 455/509
• CPC Class Codes: H04B 7/26 at least one of which is mobile

Abstract

Asynchronous mobile communication system, and method for implementing a system information broadcasting function in an asynchronous mobile communication system. Upon reception of a system information renewal message from a radio network controller, a base station stores RSIMs generated by all information block segments and scheduling parameters in the message, and then calculates a first transmission time point of each of RSIMs. The base station then forms a queue of the RSIMs according to a queuing algorithm set for the RSIMs. At the end, the base station transmits the RSIM to the air when the transmission time point of a first element of the queue is the same with the current time point at every 20ms intervals. Therefore, the processing time and the use of memory in the channel card of the base station can be optimized.

Claims

1. A method for implementing a system information broadcasting function in an asynchronous mobile communication system, comprising the steps of:

(a) storing RSIMs(Radio resource controller System Information Messages) generated by information block segments from a radio network controller in a memory;

(b) calculating transmission time points of the RSIMs to the air;

(c) queuing the stored RSIMs in an order of transmission based on the calculated transmission time points with reference to the current time point;

(d) comparing the current time point with the transmission time point of the RSIM to be transmitted the earliest in the queued RSIMs at every preset time interval; and

,

(e) transmitting the RSIMs to the air if the current time point and the transmission time point of the RSIM are the same as a result of the comparison.

2. A method as claimed in claim 1, wherein the preset time interval is 20ms.

3. A method as claimed in claim 1, wherein the memory is a channel card.

11. A method as claimed in claim 10, wherein the parameters include;

an SIB REP representing intervals the system information blocks are transmitted to the air, and

SIB_POS representing a location of each system information block segment within a transmission period.

14. An asynchronous mobile communication system as claimed in claim 13, wherein, whenever one RSIM is transmitted at fixed intervals, the control part calculates the next transmission time point of the transmitted RSIM, and forms a new queue of the RSIMs again by using a set queuing algorithm.

15. An asynchronous mobile communication system as claimed in claim 14, wherein, when the next transmission time point of the transmitted RSIM is calculated, the control part inserts the next transmission time point in place of the prior transmission time point in the queue of the RSIM.

16. An asynchronous mobile communication system as claimed in claim 13, wherein the scheduling parameters stored in the memory includes;

a parameter IB_REP for representing intervals the information block segments are transmitted to the air, and

a parameter SEG_POS for representing positions of the information block segments.

17. An asynchronous mobile communication system as claimed in claim 13, wherein the queue of the RSIMs includes addresses of the RSIMs, and the transmission time points of the RSIMs.

4. A method for implementing a system information broadcasting function in an asynchronous mobile communication system, comprising the steps of:

(a) receiving a system information renewal message from a radio network controller, and storing all RSIMs generated by information block segments and scheduling parameters contained in the message;

(b) calculating transmission time points of the RSIMs to the air, and forming a queue of RSIMs based on the transmission time points of the all RSIMs according to a set queuing algorithm;

(c) selecting a first element from the queue of the RSIMs at fixed time intervals; and

,

(d) transmitting the RSIM to the air when the transmission time point of the RSIM, the selected element, is the same with the current time point.

5. A method as claimed in claim 4, further comprising the steps of:

whenever one RSIM is transmitted to the air at fixed intervals, calculating a next transmission time point of the transmitted RSIM; and

,

forming a new queue of RSIMs taking the next transmission time point.

6. A method as claimed in claim 4, wherein the next transmission time point SFNtx of the RSIM is calculated according to the following algorithm.

SFNtx(i+1)=(SFNtx(i)+SEG_POS) % 4096 (0≦

i≦

M−

1)

Where, ‘

i’

denotes (I)th SFNtx, and ‘

M’

denotes a greatest value that satisfies IB-REP *n<

4096.

7. A method as claimed in claim 4, wherein the preset time interval is 20ms.

8. A method as claimed in claim 4, wherein the memory is a channel card.

9. A method as claimed in claim 4, wherein the transmission time point of the RSIMs is calculated according to the following algorithm.

tempSFNtx=Round (modify_time % IB_REP) * IB_REP+SEG_POS

if tempSFNtx≦

modify_time

then tempSFNtx=tempSFNtx+IB_REP

SFNtx=tempSFNtx % 4096

Where, the transmission time point value SFNtx is calculated with reference to the modify_time, and represents a transmission time point each of the RSIMs is to be transmitted to the air, and the modify_time is information contained in the system information renewal message from the mobile switching center, and represents a time point at which transmission of the RSIMs contained in the message to the air is initiated according to given parameters.

10. A method as claimed in claim 4, wherein each of the elements of the queue of the RSIMs has a transmission time point calculated according to scheduling parameters of the RSIMs the element indicates.

12. A method as claimed in claim 4, wherein each of the elements of the queue of the RSIMs includes an address of the RSIM, and a transmission time point of the RSIM.

13. An asynchronous mobile communication system comprising:

a first signal processing part for processing a system update message received from a radio network controller;

a memory for storing RSIMs generated by information block segments and scheduling parameters contained in the processed message;

a control part for calculating transmission time points of the RSIMs to the air in advance, and forming a queue of the stored RSIMs in an order of the earliest transmission to the air based on the calculated transmission time point;

a comparing part for comparing the current time point to the transmission time point of the RSIM to be transmitted at the earliest among the queue of the RSIMs at preset intervals under the control of a control signal; and

,

a second signal processing part for processing the RSIM to be transmitted to the air according to a result of the comparison.