Method of providing burst timing for high-speed data...

Details Method of providing burst timing for high-speed data... Method of providing burst timing for high-speed data...

2000-05-12

2002-12-03

Ngo, Ricky (Department: 2664)

Multiplex communications

Communication over free space

Combining or distributing information via code word channels...

C370S310100, C370S335000, C370S348000

Reexamination Certificate

active

06490268

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates generally to a method of providing burst timing in a base station (BS) of a mobile communication system, and in particular, to a method of providing forward and reverse burst timing with respect to the time of using a supplemental channel (SCH) and a supplemental code channel (SCCH) for rapid transmission of a large amount of data in a BS, taking into account a discontinuous transmission (DTX) mode.
Specifically, the present invention relates to a method of providing burst timing definable with respect to the use time of a physical channel and the start and end time of data and a method of supporting an AAL5 protocol for high-speed data transmission between BTSs by a base station transceiver system (BTS) and a base station controller (BSC) in a mobile communication system under a radio channel environment which allows high-speed data processing.
2. Description of the Related Art
Typical CDMA (Code Division Multiple Access) mobile communication systems provide mainly voice service, but the IMT-2000 (International Mobile Telecommunications-2000) standard has been developed to additionally provide high-speed data transmission. IMT-2000 mobile communication systems are capable of transmitting high quality voice and moving pictures, as well as Internet browsing.
A CDMA mobile communication system is comprised of a BS including a BTS and a BSC, a mobile switching center (MSC), and a mobile station (MS). Radio links between an MS and a BTS include a forward link directed from the BTS to the MS and a reverse link directed from the MS to the BTS.
All channels are divided into physical channels and logical channels. A logical channel is set on a physical channel and it is possible that a plurality of logical channels are set on one physical channel. If the physical channel is released, the logical channels are automatically released. However, a physical channel is not necessarily created to set up a new logical channel. If a physical channel that can carry another logical channel has already been occupied for other logical channels, all that should be done is to assign the new logical channel to the already established physical channel.
Physical channels are categorized into dedicated channels and common channels according to their characteristics. The dedicated channels are so named because they are dedicated to communication between a BS and a particular MS, and include a fundamental channel (FCH), a dedicated control channel (DCCH), and a SCH. The FCH, compatibly used with TIA/EIA-95-B, transmits voice, data, and signaling signals. The common channels indicate channels, commonly shared by a BS and a plurality of MSs. A forward physical channel transmitted to the MSs from the BS is a paging channel, and a reverse channel transmitted to the BS from an MS is an access channel. These common channels are compatible with IS-95-B.
Data communication in a mobile communication system is characterized by bursts of concentrated data transmission interspersed between long periods of no data transmission. Accordingly, the next generation mobile communication system is developed in such a way that it can operate in a discontinuous transmission (DTX) mode in which a dedicated channel is only assigned when there is data to be transmitted.
In the DTX mode, frame data is transmitted only when transmission data exists in a wired communication system or in a mobile communication system. Hence, if transmission data is absent for a predetermined time period in the DTX mode, frame data is not transmitted. The DTX mode has the distinctive advantages of minimum transmission power, reduction of the strength of interference which adversely affects the system, and increase of total system capacity.
The DTX mode is supported on a DCCH and an SCH. Because of this, the DCCH can be used as a control channel which provides an efficient packet service. In DTX mode, null frames are transmitted on the DCCH for power control and no data is transmitted on the SCH. Considering limited radio resources, BS capacity, and power consumption of an MS, dedicated traffic and control channels are connected only during actual data transmission and released during non-transmission periods while in the DTX mode. Communication is conducted on a common channel while the dedicated channels are released. As a result, the usage efficiency of the radio resources is increased. Various channel states are set according to channel assignment and the presence or absence of state information in order to implement the DTX mode.
FIG. 1
is a state transition diagram for a typical packet service in a mobile communication system.
Referring to
FIG. 1
, a packet service is comprised of an active state
11
, a control hold state
12
, a suspended state
13
, a dormant state
14
, a packet null state
15
, and an initialization state
10
. Service options are connected in the control hold state
12
, the active state
11
, and the suspended state
13
. It is to be noted herein that the present invention pertains to a base station which supports the DTX mode on an SCH and a DCCH in the active state
11
and the control hold state
12
.
FIG. 2
illustrates a reference model of
3
G IOS (Interoperability Specifications) for a digital air interface between an MSC and a BS and between BSs in a general mobile communication system.
Referring to
FIG. 2
, an A
1
interface and an A
2
/A
5
(exclusive for circuit data) interface are defined for transmitting a signal and transmitting user information, respectively, between an MSC
20
and a BSC
32
. An A
3
interface is defined to connect a target BS
40
to a frame selection/distribution function unit (SDU)
34
of a source BS
30
for soft/softer handoff between BSs. Using the A
3
interface, signaling and user data are transmitted between the target BS
40
and the SDU
34
of the source BS
30
. An A
7
interface is defined to transmit/receive signals between the target BS
40
and the source BS
30
for soft/softer handoff between BSs. Wired communications links between the BSs
30
and
40
and between the BS
30
and the MSC
20
are a forward link directed from the MSC
20
to the BS
30
, a reverse link directed from the BS
30
to the MSC
20
, and a link connected between the BSs
30
and
40
. The MSC
20
has a call control & mobility management block
22
and a switch
24
. The MSC
20
is connected to a data network (not shown) such as the Internet via an inter-working function (IWF) block
50
.
FIG. 3
illustrates a signal flow by which an SCH is established between a source BS and a target BS in conventional technology. This procedure is executed to establish an SCH between the source BS and the target BS when a large amount of high rate data is received from an external Packet Data Service Node (PDSN) or data is to be transmitted by assigning the SCH upon call origination from an MS.
Referring to
FIG. 3
, the source BS
30
recognizes that an MS has origination/termination data to transmit/receive to/from another MS or the PSDN (
3
a
). Then, the source BS
30
determines a traffic burst required during service instance support, selects the target BS
40
which will assist the determined traffic burst, and transmits a burst request message (A
7
-Burst Request msg.) to the target BS
40
, requesting reservation of necessary resources (
3
b
). The target BS
40
checks whether part or all of the requested resources are available and transmits a burst response message (A
7
-Burst Response msg.) including information about the resources committed for the traffic burst to the source BS
30
(
3
c
). Meanwhile, the source BS
30
awaits receipt of the burst response message for a first predetermined time Tbstreq after transmission of the burst request message. Upon receipt of the burst response message within Tbstreq, the source BS
30
prepares a set of frame selectors based on the information of the burst response message and transmits a burst activate message (A
7
-Burst Activate msg.), which indicates a set of

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