WO2009038524A2 - Improved power usage in tdd mbms - Google Patents

Improved power usage in tdd mbms Download PDF

Info

Publication number
WO2009038524A2
WO2009038524A2 PCT/SE2008/050989 SE2008050989W WO2009038524A2 WO 2009038524 A2 WO2009038524 A2 WO 2009038524A2 SE 2008050989 W SE2008050989 W SE 2008050989W WO 2009038524 A2 WO2009038524 A2 WO 2009038524A2
Authority
WO
WIPO (PCT)
Prior art keywords
transceiver
mbms
carrier
sectors
system
Prior art date
Application number
PCT/SE2008/050989
Other languages
French (fr)
Other versions
WO2009038524A3 (en
Inventor
Jiuhui Du
Jie Mao
Bin Xu
Original Assignee
Telefonaktiebolaget L M Ericsson (Publ)
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to SE0702064-7 priority Critical
Priority to SE0702064 priority
Application filed by Telefonaktiebolaget L M Ericsson (Publ) filed Critical Telefonaktiebolaget L M Ericsson (Publ)
Publication of WO2009038524A2 publication Critical patent/WO2009038524A2/en
Publication of WO2009038524A3 publication Critical patent/WO2009038524A3/en

Links

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B1/00Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69Spread spectrum techniques
    • H04B1/707Spread spectrum techniques using direct sequence modulation
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B2201/00Indexing scheme relating to details of transmission systems not covered by a single group of H04B3/00 - H04B13/00
    • H04B2201/69Orthogonal indexing scheme relating to spread spectrum techniques in general
    • H04B2201/707Orthogonal indexing scheme relating to spread spectrum techniques in general relating to direct sequence modulation
    • H04B2201/70701Orthogonal indexing scheme relating to spread spectrum techniques in general relating to direct sequence modulation featuring pilot assisted reception
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04JMULTIPLEX COMMUNICATION
    • H04J13/00Code division multiplex systems
    • H04J13/16Code allocation

Abstract

A method (500) for use in a wireless communication system (200, 400) which operates according to the TDD principle, in which system there is (510) a transceiver (240, 423) which can transmit to users (211, 221, 231 ) in a certain coverage area according to the TDD principle. According to the method, a first MBMS (Multimedia Broadcast Multicast Service) carrier can be included in at least a first time slot (120, 320) in at least one of said time frames, and the transceiver is equipped with an antenna which can transmit in a number of azimuth sectors or beams (210, 220 230; 410, 420, 430) with the MBMS carrier being included in at least a number of said sectors or beams, the MBMS carrier being transmitted (540) with a certain scrambling code and midamble code.

Description

IMPROVED POWER USAGE IN TDD MBMS.

TECHNICAL FIELD The present invention discloses a method and a device intended for use in a wireless communications system which operates according to the TDD principle (Time Division Duplex), in particular a system which can include transmissions according to the MBMS (Multi-media Broadcast Multi-cast Service) system.

BACKGROUND

The so-called MBMS technology (Multi-media Broadcast Multi-cast service), is broadly accepted and introduced into newer versions of the 3GPP (3G Partnership Project) standards. It is developed based on WCDMA (Wide- band CDMA) and WCDMA HSDPA (High Speed Downlink Packet Access), with some devices already having been released.

TD-MBMS is the abbreviation of TD-SCDMA (Time Division -Synchronous Code Division Multiple Access) MBMS, which is a standard in CCSA (Chinese Communication Standardization Association).

In order for MBMS technology to be successfully integrated into TD-SCDMA systems, there will be a need to adapt the MBMS technology or services to such challenges as time slot utilization, power allocation, power optimization and channelization code number, as well as some TD-SCDMA specific characteristics such as, for example, the N-carrier technology.

The solution or solutions which is/are adapted in order to adapt MBMS technology to TD-SCDMA systems should preferably be based on principles which allow a minimization of such factors as system interference, while at the same time allowing for an optimization of the radio resource assignment. A possible solution to the integration of MBMS in TD-SCDMA systems is the CCSA technology known as UTN (Unique Timeslot networking), which is a technology that has as one of its basic ideas to assign a dedicated time slot in a TDD time frame to be the bearer of MBMS services in TD-SCDMA networks and in networks which have evolved from TD-SCDMA. Therefore, using UTN solutions, it would be possible to handle power and other radio resources, and the impact of MBMS services on "traditional" services such as those afforded by existing, older, 3GPP standards could be kept down to a minimum.

The abstract of the Chinese patent document 101022595 discloses a specific method for use in a TD-SCDMA system in which it is desired to use MBMS services. According to the disclosure of this document, MBMS is enabled in a TD SCDMA system by enabling UTN (Unique Timeslot Networking) in the system.

The IEEE document by Tang et al, from IEEE 2005 International Conference, "Power efficient broadcasting and multicasting in wireless networks with directional antennas", volume 3, pages 1438-1442, discloses a method for saving transmission power in an ad hoc network. The method which is disclosed is a resource management algorithm.

SUMMARY

Thus, as shown above, the UTN technology is a possible solution to the integration of MBMS into CCSA TD SCDMA standards. However, a variety of factors need to be taken into account when integrating MBMS into UTS technology, such as, for example, the need to guarantee the coverage of the MBMS services and compatibility with various existing TD-SCDMA systems.

A solution which addresses this need, and which allows for a successful integration of MBMS into UTN technology, is offered by the present invention in that it discloses a method for use in a wireless communication system which operates according to the TDD (Time Division Duplex) principle,

In the system of the invention, there is at least one transceiver which can transmit to users in a certain coverage area, such as a cell in the system, according to the TDD principle, so that the transceiver transmits in a number of time frames, each of which is divided into a number of time slots.

According to the method of the invention, a first MBMS (Multimedia Broadcast Multicast Service) carrier can be included in at least a first time slot in at least one of said time frames, and the transceiver is equipped with an antenna which can transmit in a number of azimuth sectors or beams.

According to the method of the invention, the MBMS carrier is included in at least a number of said sectors, and is transmitted with a certain scrambling code and midamble code.

Thus, by means of the invention, it becomes possible to transmit MBMS services in spatial isolation, which will benefit the transmission power utilization in a UTN time slot among N carriers and which may also reduce the Multiple Access Interference (MAI) both in the UTN time slot and among adjacent cells.

Suitably, the MBMS carrier is transmitted in a first sector with at least one of the scrambling and midamble codes being different from that of sectors which are adjacent to said first sector, and the MBMS carrier is transmitted with a certain scrambling code and midamble code.

In a particular embodiment of the invention, the system ascertains where in the coverage area or cell of the transceiver that there are users of the MBMS services, and only includes the MBMS carrier in transmissions which cover sectors in which there are such users. In another embodiment, there can be included a second MBMS carrier in said first time slot, and this second MBM carrier can be used as a "secondary" carrier, which can either be active or non-active, as chosen by the system or by an operator of the system, in order to improve the radio resource utilization of the system.

The invention also discloses a transceiver for use in a system of the invention.

BRIEF DESCRIPTION OF THE DRAWINGS

The invention will be describe in more detail in the following, with reference to the appended drawings, in which

Fig 1 shows a time frame in a first system of the invention, and Fig 2 shows a top view of a first system of the invention, and

Fig 3 shows a time frame in a second system of the invention, and Fig 4 shows a top view of a second system of the invention, and Fig 5 is a flowchart of a method 500 according to the invention, and Fig 6 shows a block diagram of a transceiver of the invention.

DETAILED DESCRIPTION

As has been explained above, the present invention is intended for use in a wireless communications system which operates according to the Time Division Duplex (TDD) principle. In such a system, transmission and reception will take place in time frames, which in turn are divided into a number of time slots within a radio frame.

The invention will in the following be described with the aid of examples from a so called Unique Timeslot Networking UTN, which is a TDD MBMS (Multimedia Broadcast Multicast Services) system defined by the CCSA, the Chinese Communication Standardization Association. In particular, the examples in the following will show how MBMS services can be integrated into an UTN system. However, the invention can be applied in other applications where it is desired to integrate a certain kind of services, such as the MBMS, into a TDD system such as the UTN.

Fig 1 shows a time frame 100 according to the invention. As shown in fig 1 , the time frame 100 is a UTN time frame which is divided into a number of downlink (i.e. transmissions to user terminals in the system) timeslots 110- 140. The number of timeslots in the time frame, i.e. four, is merely an example, a time frame for use in the invention can comprise more or less any number of timeslots, as defined by the system in which the invention is applied.

According to the invention, and as indicated in fig 1 , an MBMS carrier is included in at least one timeslot 120 in UTN the time frame 100 of the invention. In this manner, MBMS services may be offered by a UTN system.

Fig 2 shows a top view of a part of a system 200 according to the invention: as shown in fig 2, the system 200 comprises at least one transceiver 240, such as a base station in a cellular communications system, in some systems referred to as the NodeB.

As also shown in fig 2, the transceiver 240 covers a certain area within the system, in the case of a cellular communications system a so called cell, and according to the invention the transceiver 240 is equipped with an antenna which can transmit in at least a number of sectors of that cell, examples of such sectors being shown as 210, 220 and 230 in fig 2.

The amount of sectors shown in fig 2 should be seen merely as an example, the number of sectors can be varied widely within the scope of the invention. The same can also be said for the angular ("azimuth") coverage of each sector: the sectors in fig 2 are shown as having more or less equal widths, which can of course also be varied within the scope of the invention. As is also indicated in fig 2, there can be a number of users within the coverage area or cell of the transceiver 240. Such users are indicated as 211 , 221 , and 231 in fig 2. Naturally, the number of users shown should also be seen only as an example intended to facilitate the reader's understanding of the present invention. One of the roles of the base station 240 is to control traffic to and from the users in the cell.

Thus, the transceiver 240 can transmit in sectors such as those shown in fig 2, and can do so according to the TDD principle, in the manner shown in fig 1 , i.e. with at least one MBMS carrier in at least one of the TDD time slots 120.

In order to achieve good isolation between users in the different sectors, the transceiver 240 will, in at least one embodiment of the invention, transmit the

MBMS carrier with different codes in adjacent sectors. Present day UTN systems can use the same scrambling code and the same midamble code in adjacent sectors. In a UTN system in which the present invention is applied, the MBMS carrier is suitably transmitted in a first sector with the same or different scrambling and midamble codes among adjacent sectors, in order to increase the isolation between the adjacent sectors. Preferably, both the scrambling code and the midamble code differ between adjacent sectors.

As has been mentioned above, one of the goals of the invention is to enable an efficient use of MBMS in a TDD system such as UTN. In a particular embodiment of the invention, this is done by means of letting the transceiver

240 ascertain in which, if any, sectors of the cell that there are users of the

MBMS services. The transceiver 240 will then only transmit the MBMS carrier in those sectors in which there are users of the MBMS services, which will aid in conserving energy, or make the use of one and the same amount of energy resources more efficient. The exact method by means of which the transceiver ascertains in which sectors, if any, that there are users of MBMS services is not the core of this invention, but one useful way would be to introduce an up-link (i.e. from the users to the transceiver) feedback, by means of which the users could inform the transceiver that they are/aren't users of the MBMS services. This could be implemented either by letting all users inform their NodeB of what kind of user they are, i.e. MBMS/non-MBMS, or by letting only MBMS users inform their NodeB of the fact that they are MBMS users.

Fig 3 shows a time frame 300 as used in a particular embodiment of the invention. The time frame 300 is divided into a number of time slots 310-340, in similarity to the time frame 100 of fig 1 , with a first MBMS carrier, MBMS1 , being included in a first time frame 320. However, in order to improve the MBMS services of the system, a second MBMS carrier, MBMS2, has been added in the same time slot 320 as the first MBMS carrier.

According to the invention, one of the carriers MBMS1 and MBMS2 is used as a "primary" carrier, i.e. it is always active, at least in sectors in which there are MBMS users, and the other carrier is used as a "secondary" carrier, i.e. it can be active or non-active, as chosen by the system or by an operator of the system. The use of the secondary carrier as active or non active is suitably chosen by the system or the operator based on the amount of MBMS services which are needed.

Returning now to the system as shown in fig 2, as has been mentioned previously in this text, the transceiver 240 is equipped with an antenna which can transmit in a number of sectors, examples of which are shown in fig 2 as 210, 220 and 230.

Such an antenna can be obtained in a number of ways, for example by means of so called "Higher order Sectorization", HoS, by means of which it is possible to obtain a larger amount of individual antenna sectors for the coverage area of the transceiver.

Another possibility which would make it possible to obtain individual antenna sectors for the coverage area of the transceiver would be to use an antenna with so called multi-beam technology.

Both of the technologies mentioned, i.e. HoS antennas and multi-beam antennas are technologies which as such are well known to those skilled in the field, and are also not at the core of the invention. These technologies will for that reason not be described in detail here.

However, a system 400 which makes use of a multi-beam antenna is shown in fig 4: the system 400 is in many ways similar to the system 200 shown in fig 2. Thus, the system 400 is a TDD system, and comprises a first transceiver 423, and can have a number of users 411 , 421 , 431.

The transceiver 423 is equipped with a multi-beam antenna, which in fig 4 is shown symbolically by means of each of the users 411 , 421 , 431 being "covered" by individual antenna beams 410, 420, 430 respectively. Naturally, in a multi-beam system, there can be more than one user per beam, the configuration shown in fig 4 is merely an example intended to facilitate the understanding of the principle.

Similarly, other antenna technologies than multi-beam technology can be used for the same purpose, such as, for example, adaptive beam forming by software control.

Fig 5 is a schematic flowchart of some major steps of a method 500 according to the invention. Steps which are options or alternatives are indicated with dashed lines. Thus, the method 500 is intended for use in a wireless communication system which operates according to the TDD principle, and, as indicated in step 510 in fig 5, the system can include at least one transceiver which can transmit to users in a certain coverage area according to the TDD principle.

Thus, the transceiver transmits in a number of time frames, each of which is divided into a number of time slots, and as shown in step 520, a first MBMS (Multimedia Broadcast Multicast Service) carrier can be included in at least a first time slot in at least one of said time frames.

As shown in step 530, the transceiver can be equipped with an antenna which can transmit in a number of azimuth sectors or beams, and the MBMS carrier can be included in at least a number of those sectors or beams. Step 540 shows that according to the method 500, the MBMS carrier is transmitted with a certain scrambling code and midamble code.

As indicated in step 550, the MBMS carrier may be transmitted in a first sector, with at least one of the scrambling and midamble codes being different from that of sectors which are adjacent to said first sector.

Step 560 shows that the system may be given a function for ascertaining where in the coverage area of the transceiver that there are users of the MBMS services, and for only including the MBMS carrier in transmissions which cover sectors in which there are such users.

As shown in step 570, there can be included a second MBMS carrier in said first time slot. Step 580 shows that according to the inventive method, one of the two carriers may then be used as a "primary" carrier, i.e. always active, at least in sectors in which there are MBMS users, with the other carrier being used as a "secondary" carrier, i.e. active or non-active, as chosen by the system or by an operator of the system. Step 590 shows that the transceiver of the system in which the invention is used may is equipped with an antenna which uses the so called Higher order Sectorization, HoS, in order to obtain individual antenna sectors for the coverage area of the transceiver, as alternatives to which so called multi- beam technology or beam forming using software (BF-SW) may be employed by the antenna of the transceiver.

Fig 6 shows a schematic block diagram of a transceiver 600 of the invention. As can be seen in fig 6, the transceiver 600 comprises an antenna 610 for communicating with, for example, the users in the system, and also comprises a transmitter 630 and a receiver 620. In addition, the transceiver 600 also comprises a control means such as for example a microprocessor 640, as well as comprising a memory 550.

As has also emerged from the description above, the transceiver 600 is intended for use in a wireless communication system which operates according to the TDD (Time Division Duplex) principle.

The transceiver is equipped with the antenna 610, the transmitter 630 and the control means 640 which aids the transceiver in transmitting to users in a number of time frames 100, 300, according to the TDD principle, so that each of the time frames is divided into a number of time slots.

The transceiver is also equipped with means such as the controller 640, the memory 650 and the transmitter 630 for including a first MBMS (Multimedia Broadcast Multicast Service) carrier in at least a first time slot in at least one of said time frames.

The antenna 610 also aids the transceiver 600 in transmitting in a number of azimuth sectors, and the transceiver has means such as the controller 640 and the memory 650 for including the MBMS carrier in at least a number of said azimuth sectors or beams, and also has means such as the transmitter 630, the controller 640, and the memory 650 for transmitting the MBMS carrier with a certain scrambling code and midamble code.

In a certain embodiment, the transceiver 600 transmits the MBMS carrier in a first sector with at least one of the scrambling and midamble codes being different from that of sectors which are adjacent to said first sector.

The transceiver 600 may also be equipped with means such as the antenna 610, the receiver 620, the controller 640, and the memory 650 for ascertaining where in the coverage area of the transceiver that there are users of the MBMS services, for only including the MBMS carrier in transmissions which cover sectors in which there are such users.

The transceiver 600 may also use the controller 640 and the memory 650 for including a second MBMS carrier in the first time slot. The transceiver 600 may in this case uses one of the carriers as a "primary" carrier, i.e. always active, at least in sectors in which there are MBMS users, and use the other carrier as a "secondary" carrier, i.e. active or non-active, as chosen by the system or by an operator of the system.

The antenna 610 of the transceiver may uses the so called Higher order Sectorization, HoS, or multi-beam technology in order to obtain individual antenna sectors for the coverage area of the transceiver.

The invention is not limited to the examples of embodiments shown in the drawings and described above, but may freely be varied within the scope of the appended claims.

Claims

1. A method (500) for use in a wireless communication system (200, 400) which operates according to the TDD (Time Division Duplex) principle, in which system there is (510) at least one transceiver (240, 423) which can transmit to users (211 , 221 , 231) in a certain coverage area according to the TDD principle, so that the transceiver (240, 423) transmits in a number of time frames (100, 300), each of which is divided into a number of time slots (110, 120, 130, 140; 310, 320, 330, 340), the method being characterized in that (520) a first MBMS (Multimedia Broadcast Multicast Service) carrier can be included in at least a first time slot (120, 320) in at least one of said time frames, and in that (530) the transceiver is equipped with an antenna which can transmit in a number of azimuth sectors or beams (210, 220 230; 410, 420, 430) with the MBMS carrier being included in at least a number of said sectors, the MBMS carrier being transmitted (540) with a certain scrambling code and midamble code.
2. The method (500, 550) of claim 2, according to which the MBMS carrier is transmitted in a first sector with at least one of the scrambling and midamble codes being different from that of sectors which are adjacent to said first sector.
3. The method (500, 560) of claim 1 or 2, according to which the system ascertains where in the coverage area of the transceiver that there are users of the MBMS services, and only includes the MBMS carrier in transmissions which cover sectors in which there are such users.
4. The method (500, 570) of any of claims 1-3, according to which there can be included a second MBMS carrier in said first time slot.
5. The method (500, 580) of claim 4, according to which one of said carriers is used as a "primary" carrier, i.e. always being active, at least in sectors in which there are MBMS users, and the other carrier being used as a "secondary" carrier, i.e. active or non-active, as chosen by the system or by an operator of the system.
6. The method (500, 590) of any of the previous claims, according to which the transceiver is equipped with an antenna which uses the so called Higher order Sectorization, HoS, in order to obtain individual antenna sectors for the coverage area of the transceiver.
7. The method (500, 590) of any of claims 1-5, according to which the transceiver is equipped with an antenna which uses multi-beam technology in order to obtain individual antenna beams for the coverage area of the transceiver.
8. The method (500, 590) of any of claims 1-5, according to which the transceiver is equipped with an antenna which uses adaptive beam forming by software control in order to obtain individual antenna beams for the coverage area of the transceiver.
9. The method of any of the previous claims, applied to a TDD system which is a TD SCDMA system which uses UTN, Unique Timeslot Networking.
10. A transceiver (600) for use in a wireless communication system (200, 400) which system operates according to the TDD (Time Division Duplex) principle, said transceiver thus being equipped with means (610, 630, 640) for transmitting to users (211 , 221 , 231 ) in a number of time frames (100, 300), each of which is divided into a number of time slots (110, 120, 130, 140; 310, 320, 330, 340), the transceiver being characterized in that it is equipped with means (640 650 630) for including a first MBMS (Multimedia Broadcast Multicast Service) carrier in at least a first time slot (120, 320) in at least one of said time frames, and in that the transceiver is equipped with an antenna (610) which can transmit in a number of azimuth sectors (210, 220 230; 410, 420, 430), said transceiver being equipped with means (640, 650) for including the MBMS carrier in at least a number of said sectors, and with means (630, 640, 650) for transmitting the MBMS carrier with a certain scrambling code and midamble code.
11. The transceiver (600) of claim 10, in which the MBMS carrier is transmitted in a first sector with at least one of the scrambling and midamble codes being different from that of sectors which are adjacent to said first sector.
12. The transceiver (600) of claim 10 or 11 , being equipped with means (610, 620, 640, 650) for ascertaining where in the coverage area of the transceiver that there are users of the MBMS services, for only including the MBMS carrier in transmissions which cover sectors in which there are such users.
13. The transceiver (600) of any of claims 10-12, being equipped with means (640, 650) for including a second MBMS carrier in said first time slot.
14. The transceiver (600) of claim 13, which uses one of said carriers as a "primary" carrier, i.e. always active, at least in sectors in which there are
MBMS users, and which uses the other carrier as a "secondary" carrier, i.e. active or non-active, as chosen by the system or by an operator of the system.
15. The transceiver (600) of any of claims 10-14, being equipped with an antenna (610) which uses the so called Higher order Sectorization, HoS, in order to obtain individual antenna sectors for the coverage area of the transceiver.
16. The transceiver (600) of any of claims 10-14, being equipped with an antenna (610) which uses multi-beam technology in order to obtain individual antenna sectors for the coverage area of the transceiver.
17. The transceiver (600) of any of claims 10-16, being a transceiver for a TDD system which uses TD-SCDMA UTN.
PCT/SE2008/050989 2007-09-17 2008-09-03 Improved power usage in tdd mbms WO2009038524A2 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
SE0702064-7 2007-09-17
SE0702064 2007-09-17

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN 200880101033 CN101765981A (en) 2007-09-17 2008-09-03 Improved power usage in TDD MBMS

Publications (2)

Publication Number Publication Date
WO2009038524A2 true WO2009038524A2 (en) 2009-03-26
WO2009038524A3 WO2009038524A3 (en) 2009-05-07

Family

ID=40468668

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE2008/050989 WO2009038524A2 (en) 2007-09-17 2008-09-03 Improved power usage in tdd mbms

Country Status (2)

Country Link
CN (1) CN101765981A (en)
WO (1) WO2009038524A2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101964944B (en) 2009-07-21 2013-03-27 中兴通讯股份有限公司 Method and system for isolating interference of multimedia broadcast and multicast service cell

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003077453A2 (en) * 2002-03-13 2003-09-18 Nokia Corporation Wireless telecommunications system using multislot channel allocation for multimedia broadcast/multicast service
US20040116125A1 (en) * 2002-08-07 2004-06-17 Interdigital Technology Corporation Channel switching for support of multimedia broadcast and multicast services
CN101022595A (en) * 2007-03-28 2007-08-22 中兴通讯股份有限公司 Method for sending and receiving MBMS using single-slot network in TD-SCDMA

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003077453A2 (en) * 2002-03-13 2003-09-18 Nokia Corporation Wireless telecommunications system using multislot channel allocation for multimedia broadcast/multicast service
US20040116125A1 (en) * 2002-08-07 2004-06-17 Interdigital Technology Corporation Channel switching for support of multimedia broadcast and multicast services
CN101022595A (en) * 2007-03-28 2007-08-22 中兴通讯股份有限公司 Method for sending and receiving MBMS using single-slot network in TD-SCDMA

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
'3GPP TSG RAN WG2 #31 R2-022110', 18 August 2002, STOCKHOLM, SWEDEN article 'MBMS Power Usage', pages 1 - 4, XP050121634 *
TANG, J. ET AL.: 'Communications, 2005. ICC 2005. 2005 IEEE International Conference on', vol. 3, 16 May 2005 article 'Power efficient broadcasting and multicasting in wireless networks with directional antennas', pages 1438 - 1442, XP010825523 *
YANG XIAO ET AL.: 'Communication Technology Proceedings, 2003. ICCT 2003. International Conference on', vol. 2, 09 April 2003 article 'Communication capacity of TD-SCDMA systems', pages 1185 - 1189, XP010644063 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101964944B (en) 2009-07-21 2013-03-27 中兴通讯股份有限公司 Method and system for isolating interference of multimedia broadcast and multicast service cell

Also Published As

Publication number Publication date
CN101765981A (en) 2010-06-30
WO2009038524A3 (en) 2009-05-07

Similar Documents

Publication Publication Date Title
Dahlman et al. WCDMA-the radio interface for future mobile multimedia communications
RU2395905C2 (en) Method and device for wireless communication with multiple carriers
CN1227940C (en) Utilization of plural multiple access types for mobile telecommunications
EP1078543B1 (en) Code allocation for sectorised radiocommunication systems
Shan et al. Distributed cooperative MAC for multihop wireless networks
EP1420538B1 (en) Method for gated transmission in a CDMA communication system
US7594010B2 (en) Virtual antenna array
EP1582076B1 (en) Method and system for organizing the cells of a wireless communication system and allocating resources to provide multimedia broadcast services
Parkvall et al. Evolving 3G mobile systems: Broadband and broadcast services in WCDMA
US6507601B2 (en) Collision avoidance
JP2876517B2 (en) Cdma / tdd system base station apparatus and cdma / tdd type mobile station apparatus and cdma / tdd system wireless communication system and cdma / tdd scheme radio communication method
US8014782B2 (en) Fast setup of physical communication channels
JP4278512B2 (en) Method and apparatus for time sharing channelization codes in a CDMA communication system
KR101050522B1 (en) Method, Device and Terminal for Physical Layer Random Access in Wideband TD Mobile Communication System
US8254316B2 (en) QOS-based multi-protocol uplink access
US9319130B2 (en) Flexible subframes
JP4616996B2 (en) Data transmission method in spread spectrum communication system
Dahlman et al. UMTS/IMT-2000 based on wideband CDMA
US8391251B2 (en) Transmission method for a time division duplex mobile communication system
JP5040648B2 (en) MIMO assignment signaling
US6937641B2 (en) Power-controlled random access
JP4834326B2 (en) Inter-cell interference coordination method using power planning for OFDM mobile communication system
US7804842B2 (en) Carrier sense multiple access method and wireless terminal apparatus
US20100118835A1 (en) Method and apparatus for channel access in a wireless communications system
JP3078330B2 (en) Remote transmitter power control in Cdma communication system

Legal Events

Date Code Title Description
WWE Wipo information: entry into national phase

Ref document number: 200880101033.8

Country of ref document: CN

121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 08831878

Country of ref document: EP

Kind code of ref document: A2

NENP Non-entry into the national phase in:

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 08831878

Country of ref document: EP

Kind code of ref document: A2