WO2011018112A1 - Method of transmitting data in a communications network - Google Patents

Method of transmitting data in a communications network Download PDF

Info

Publication number
WO2011018112A1
WO2011018112A1 PCT/EP2009/060494 EP2009060494W WO2011018112A1 WO 2011018112 A1 WO2011018112 A1 WO 2011018112A1 EP 2009060494 W EP2009060494 W EP 2009060494W WO 2011018112 A1 WO2011018112 A1 WO 2011018112A1
Authority
WO
WIPO (PCT)
Prior art keywords
time interval
hs
part
transmission time
channelization code
Prior art date
Application number
PCT/EP2009/060494
Other languages
French (fr)
Inventor
Harri Kalevi Holma
Antti Anton Toskala
Hannu Tapio Hakkinen
Original Assignee
Nokia Siemens Networks Oy
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
Application filed by Nokia Siemens Networks Oy filed Critical Nokia Siemens Networks Oy
Priority to PCT/EP2009/060494 priority Critical patent/WO2011018112A1/en
Publication of WO2011018112A1 publication Critical patent/WO2011018112A1/en

Links

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04JMULTIPLEX COMMUNICATION
    • H04J13/00Code division multiplex systems
    • H04J13/16Code allocation
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B7/00Radio transmission systems, i.e. using radiation field
    • H04B7/24Radio transmission systems, i.e. using radiation field for communication between two or more posts
    • H04B7/26Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
    • H04B7/2628Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile using code-division multiple access [CDMA] or spread spectrum multiple access [SSMA]
    • H04B7/2637Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile using code-division multiple access [CDMA] or spread spectrum multiple access [SSMA] for logical channel control

Abstract

A method of transmitting data in a communications network, wherein part of a data channel channelization code is shared in a TDMA fashion between user entities in the network during a transmission time interval, and wherein a particular control channel channelization code is allocated to be used for the control channel for a particular user entity and the allocated channelization code indicates which part of the transmission time interval can be used by that particular user entity.

Description

METHOD OF TRANSMITTING DATA IN A COMMUNICATIONS NETWORK FIELD OF THE INVENTION The invention generally relates to a method of transmitting data in a communications network and, more particularly, to a communications network using 3GPP HSDPA Multiple Input Multiple Output (MIMO) transmission.

BACKGROUND OF THE INVENTION

High speed downlink packet access (HSDPA) for wideband code division multiple access (WCDMA) is the key new feature in 3GPP Release 5 specifications. HSDPA has been designed to increase downlink packet data throughput by means of fast physical layer (Ll) retransmission and transmission combining, as well as fast link adaptation controlled by the Node B (Base Transceiver Station (BTS)).

HSDPA allows downlink packet transmission at peak data rates increased to significantly higher than 2Mbps, and which can theoretically exceed 10 Mbps (up to 14 Mbps) . Furthermore, packet data throughput is increased by 50-100% by HSDPA in 3GPP Release 5 compared to packet data throughput in 3GPP Release 4, with a reduced delay from retransmissions. This is achieved by using adaptive modulation and coding using both QPSK (quadrature phase shift keying) and 16-QAM (quadrature amplitude modulation) . Downlink fast scheduling in HSDPA is performed directly by the Node B based on a knowledge of the channel quality of the user entity (UE) , for example a mobile terminal or PDA, the capability of the UE, quality of service

(QoS) demands, power and code resource availability, and the buffer status of the Node B. In a HSDPA downlink channel structure, the high speed downlink shared channel (HS-DSCH) carries the user data in the downlink direction. The high speed shared control chan- nel (HS-SCCH) carries the necessary physical layer control information to enable decoding of the data on the HS-DSCH.

The HS-DSCH does not carry any physical layer control or pilot information, only user data (as well as MAC layer/RLC layer headers) . The transmission time interval (TTI) or interleaving period has been defined to be 2 ms to achieve a short round-trip delay for the operation between the terminal and Node B for retransmissions. The HS-DSCH 2 ms TTI is short compared with the 10, 20, 40 or 80 ms TTI sizes sup- ported in 3GPP Release 99. In the code domain, the SF is fixed at 16 and multi-code transmission as well as code multiplexing of different users can take place. The maximum number of codes that can be allocated is 15, but depending on the UE capability, individual terminals may receive a maximum of 5, 10 or 15 codes.

The HS-SCCH is a fixed data rate channel with SF 128 (60kbps). It carries the key information necessary for HS- DSCH demodulation by the UE. The UMTS terrestrial radio ac- cess network (UTRAN) allocates a number of HS-SCCHs that correspond to the maximum number of users that will be code- multiplexed. If there are no data on the HS-DSCH, then there is no need to transmit the HS-SCCH. There may be a high number of HS-SCCHs allocated in the network but generally each UE will only need to consider a maximum of four HS-SCCHs at a given time. The HS-SCCHs that are to be considered are signalled to the UE by the network. More than one HS-SCCH may be needed to match the available codes better to the terminals with limited HSDPA capability. HSDPA Multiple Input Multiple Output (MIMO) transmission has been defined in 3GPP Release 7 to enable a data rate of 28 Mbps . In release 8, the combination of MIMO and 64 QAM is mainly targeted to increase the peak data rate and provide an increase in spectral efficiency.

HSDPA MIMO uses two modes, with the mode being selected based on feedback from the UE to the Node B. Dual stream (multis- tream) transmission mode is used when feedback from the UE indicates that channel conditions are good (for a high CQI), which provides the advantage of doubling the data rate. Single stream transmission is used otherwise (for a low CQI), which provides the advantage of interference resistance.

Single stream transmission (which is a fallback mode) rotates the relative transmission phases from two BTS antennas according to UE feedback. The phase rotation is carried out per UE, with the target being to enable coherent combination of the two signals in UE reception.

It transpires that code multiplexing of MIMO UEs with a fallback mode (single stream transmission mode) causes problems. The reason for this is that the UE equalizer assumes that all intra-cell interference propagates via the same channel. This is bad for the equalizer when users are code multiplexed since MIMO fallback mode uses different antenna weights for different users and thus results in interference. When the phase rotation is performed per UE, it appears as if each of the different downlink transmissions had different downlink transmissions had a different propagation channel. Furthermore, in practical applications with small data packets, a single user cannot fully fill the 2 ms time slots and 15 codes used in HSDPA. A number of workaround solutions have been proposed to this problem, which enables the co-existence of legacy non-MIMO UEs and MIMO UEs. However, none of these solutions have ad- dressed the fundamental problems of code multiplexing several MIMO UEs in the same transmission time interval (TTI) . The general assumption for these workaround solutions has been that code multiplexing is not required. However, this is not efficient in practice since code multiplexing is essential for handling the network capacity when the amount of data in the transmission buffer is limited.

The reason it is required to multiplex several users (UEs) in each TTI is that there is not enough data for any individual user to completely fill the TTI of, for example, 2 ms (which is the TTI commonly used in HSDPA) . There can be several reasons why the amount of data in the NodeB (base transceiver station (BTS) ) is limited, for example, if the application data rate is low, if the transport network has limited capac- ity or if the operator chooses to limit some users' data rates in the core network. The NodeB packet scheduler must therefore take into account the amount of data that each user has in NodeB buffer. The code and time allocation can be unequal taking into account channel conditions, Quality of ser- vice (QoS) parameters and data volume in the buffer.

SUMMARY OF THE INVENTION Accordingly, the invention provides a method of transmitting data in a communications network, in which part of a data channel channelization code is shared in a TDMA fashion between user entities in the network during a transmission time interval. Control channel channelization code is assigned to a particular user entity for transmitting user specific data channel allocation information and indicates which part of the transmission time interval available for data can be used by the particular user entity.

Since there is only transmission to a single UE in each part of the TTI, this improves MIMO performance. Furthermore, this is a very simple solution allowing all of the existing 3GPP definitions, such as UE and NodeB processing times, as well as the HS-SCCH structure, to be kept, with the added NodeB requirement being only to consider which code to allocate to which user. This does not involve any modification to the Node B with regard to 3GPP Release 5 specifications, however, since in 3GPP Release 5 the NodeB is already re- quired to consider which code to allocate to which user.

Preferably, data is transmitted using at least partially HS- DSCH. In this case, the control (coding) channel is an HS- SCCH. In a network employing the HSDPA protocol, this means that at least part of the code used for HS-DSCH and indicated by the HS-SCCH is shared in the time domain between UEs during the TTI. The indication of which part of the 2 ms HS-DSCH TTI is allocated for the user is dependent on the particular channelization code used on HS-SCCH carrying the UE specific information of the HS-DSCH allocation. The channelization code chosen from the pool of HS-SCCH codes signalled from the HS-SCCH code pool tells the UE which time segment it can use during the TTI and thus which time segment or slot of the HS- DSCH the UE should demodulate. HSDPA MIMO performance is thus improved as there is only packet data transmission to a single UE within one time slot or segment of the TTI.

Advantageously, the HS-SCCH channel can indicate if TDMA is in use during the transmission time interval. In existing HSDPA protocols, the UE is told which codes to detect for the HS-SCCH and advantageously this feature can be used to tell the UE which time slot in the TTI to take (demodulate in the HS-DSCH) if the control channel (or HS-SCCH) has a TDMA flag. Therefore, legacy terminals can operate as they have done previously and will not see any difference in operation, whereas new MIMO terminals will receive this information for free without extra bits added when basing the TDMA information on the code used for HS-SCCH. The TDMA flag can be pro- vided on the HS-SCCH by, for example, adding an extra bit, using HS-SCCH orders or with CRC modification, with the CRC being modified to reflect whether TDMA is in place or not. Using CRC modification or HS-SCCH orders has the advantage that they do not require any additional data bits. The HS- SCCH orders could be used either to indicate that there is TDMA multiplexing in place continuously, as a function of the HS-SCCH code being used, or they could be used to turn the TDMA feature and off, and then, while the TDMA feature is activated, the use of TDMA multiplexing could be then based on the added extra bit on the HS-SCCH or on the specific CRC calculation pointing to the existence of TDMA multiplexing.

In one embodiment of the invention, upon receiving a part of the channelization code having the lowest channelization code index from a set of channelization codes assigned to the particular user entity, the particular user entity will only decode a first part of N parts of the transmission time interval used for data. Preferably, the transmission time interval is 2 ms . Furthermore, the transmission time interval (data) can be divided into three parts. In this case, each UE is then assigned as a minimum a third of the TTI, with its assigned code received from the HS-SCCH telling it which third to demodulate. For example, if the transmission time interval is 2 ms, the three parts or time slots will each be 0.667 ms . Advantageously, the time slot length of 0.667 ms is already the length of a WCDMA time slot. Furthermore, a device could decode more than one HS-SCCH and thus receive e.g. two slots worth of data or the code used for the HS-SCCH would indicate the first slot (or part) to be received and then additional information on the HS-SCCH would indicate if additional slots would be received as well.

The invention also provides a communications network. The communications network includes a network node and a plurality of user entities. The network node is adapted to share part of a data channel channelization code in a TDMA fashion between the user entities during a transmission time interval. Furthermore, the network node is adapted to assign a share of the part of a control channel channelization code to a particular one of the plurality of user entities. This share indicates which part of the transmission time interval can be used by the particular one of the plurality of user entities .

In this way, there is only transmission to a single UE in each part of the TTI, which improves MIMO performance. Fur- thermore, this solution can be implemented in existing networks without any hardware modification. Furthermore, modification to the UE and Node B, such as to the UE and NodeB processing times, is not required, and the existing control (coding) channel structure may be kept. All that is required is for the NodeB to consider which code to allocate to which user and, if additional information is used, then to consider calculating a cyclic redundancy check (CRC) based on a modified rule or adding an extra bit to the HS-SCCH payload and/or sending a slightly modified sequence as an HS-SCCH order .

The invention further provides a mobile station having a re- ceiving unit for receiving a TDMA share of part of a data channel channelization code from a communications network during a transmission time interval. Processing means are provided demodulating the data channel channelization code. The receiving unit is adapted to receive a particular control channel channelization code from the communications network indicating to the processing means during which part of the transmission time interval the processing means should demodulate from the data channel channelization code in use. The invention will now be described, by way of example only, with reference to specific embodiments, and to the accompanying drawings, in which:

BRIEF DESCRIPTION OF THE DRAWINGS

- Figure 1 is a simplified schematic diagram of a communications network according to an embodiment of the invention;

- Figure 2 is a simplified schematic diagram of a channel structure used in the method of transmitting data in a communications network according to a first embodiment of the invention; and

- Figure 3 is a simplified schematic diagram of a channel structure used in the method of transmitting data in a communications network according to a second embodiment of the invention. DETAILED DESCRIPTION OF EXEMPLARY EMBODIMENTS Figure 1 schematically shows a communications network according to the invention having a network node NodeB and three user entities (mobile stations or UEs) UEl, UE2 and UE3, e.g. mobile terminals, PDAs, etc., in communication with the network node NodeB. The network node NodeB contains a scheduler S. Each UE includes a receiving unit and a processor.

The communications network uses HSDPA either partially or fully.

Figure 2 is a schematic block diagram of the channel struc- ture used in the method according to a first embodiment of the invention. The HS-DSCH carries user data and the HS-SCCH is a fixed data rate control channel carrying channelization code information necessary for HS-DSCH demodulation by the

UE. In the first embodiment of the invention, all the UEs UEl, UE2 and UE3 are configured in MIMO mode.

During downlink data transmission in the network, the scheduler S in the network node NodeB selects whether to allocate more than one user during a 2 ms TTI. In case more than one user is to be allocated, the scheduler S will select the channelization code of the HS-SCCH control channel Cl, C2 or C3 to be used for each UE UEl, UE2 and UE3, respectively, using TDMA multiplexing such that the channelization code used for the HS-SCCH control channel Cl, C2 or C3 corresponds to the part of the 2 ms frame to be allocated to a particular UE UEl, UE2 or UE3 (and to be received by the UE at its receiving unit) . In other words, the channelization codes Cl, C2 or C3 of the control channel are "mapped" to a respective UE UEl, UE2 or UE3. For example, in the case where the 2 ms TTI is allocated in the slot level, 3 HS-SCCHs are chosen and each of the channelization codes chosen by the network node NodeB for the HS- SCCH will also indicate the part of the 2 ms TTI to be chosen (so that, in this example, the TTI is divided into three parts or slots of duration 0.667 ms) . In the case that the UEs are legacy devices, the 2 ms TTI would be filled with code multiplexing and in that case the HS-SSCH code could be selected freely from the list of HS-SCCH codes signaled for each device. The channelization code Cl, C2 or C3 on the HS- SCCH assigned to each UE UEl, UE2 and UE3, respectively, then indicates to each UE UEl, UE2 and UE3 (in particular to the processor in the UE) which part of the 2ms TTI to demodulate on the HS-DSCH.

In a second embodiment of the invention the network is almost the same as that described above in relation to the first embodiment, except that it comprises and additional UE UE4 so that there are four UEs UEl, UE2, UE3 and UE4. UEs UEl, UE2 and UE3 are configured in MIMO mode, while the UE UE4 is not configured in MIMO mode (or UE4 could be a legacy terminal without a MIMO capability) . Figure 3 is a simplified schematic diagram of the channel structure during two consecutive 2 ms TTIs and also shows schematically the method according to the second embodiment of the invention.

Downlink data transmission according to the second embodiment of the invention takes place for the MIMO UEs UEl, UE2 and UE3 exactly as described above in accordance with the first embodiment. The MIMO configured UEs UEl, UE2 and UE3 are time multiplexed, as in the first embodiment, while the non-MIMO configured UE UE4 is code multiplexed with the MIMO UEs. The scheduler S in the network node Node B shares part of the HS-SCCH channelization code between the MIMO configured UEs UEl, UE2 and UE3 during the 2 ms TTI using TDMA so that parts Cl, C2 and C3 of the channelization code are "mapped" to UEl, UE2 and UE3, respectively in a TDMA fashion. As with the first embodiment, each of the UEs UEl, UE2 and UE3 are assigned a third of the 2 ms TTI in the time domain so that each has a time slot of 0.667 ms . The share of the HS-SCCH code Cl, C2 or C3 assigned to each respective UE UEl, UE2 and UE3 then indicates to the UE UEl, UE2 and UE3 which part of the 2ms TTI to demodulate on the HS-DSCH.

Also during the 2 ms time interval, the scheduler S assigns the channelization code C4 of the code received on the HS- SCCH control channel to the non-MIMO configured (legacy) UE UE4 in a CDMA fashion. This share C4 of the code assigned to UE4 indicates to UE4 which code channel (s) it should demodulate on the HS-DSCH. In other words, UE4 is code multiplexed "on top of" the other UEs UEl, UE2 and UE3 so that it uses the whole 2 ms time slot. The scheduler assigns the code channel to UE4 in the HS-DSCH as with conventional HSDPA protocols so that UE4 need not be aware of the time multiplexing functionality for assigning parts of the 2 ms TTI to UEs UEl, UE2, UE3 and UE4.

In this way MIMO UEs can be multiplexed with legacy UEs, without the legacy UEs noticing any difference in operation or being aware of the time multiplexing of the other UEs. In both the first and second embodiments the HS-SCCH control channel indicates if TDMA is in use during the transmission time interval. In case the TDMA operation becomes unnecessary, for example if none of the UEs are MIMO configured, the TDMA operation may be disabled so as to improve the reliabil- ity of the signalling (in other words, the UE does not need to consider the TDMA option in decoding) .

This can be done in several ways, for example by adding an extra bit, or with CRC modification, with the CRC being modified to reflect whether TDMA is in place or not. However, this can also be done by using the HS-SCCH orders for enabling or disabling the TDMA multiplexing operation. The HS-SCCH orders are currently used, for example, for DRX activation and de-activation.

The orders for activation and deactivation of Secondary serving HS-DSCH cell are given in 3GPP TS 25.212 V8.5.0 (2009-03) Section 4.6C.2.2.2 as follows:

(Citation from 3GPP TS 25.212 V8.5.0 (2009-03) Section

4.6C.2.2.2)

For this Order type (orders for activation and deactivation of Secondary serving HS-DSCH), xOrd,i, Xord,2, xOrd,3 is comprised of:

- Reserved (2 bits) :

X-OTd1Ir Xord,2 ~ X res, Ir X res, 2

- Secondary serving HS-DSCH cell activation (1 bit) :

Xord,3 ~ ^secondary, 1 If xSecondary,i= λ0' , then the HS-SCCH order is a Secondary serving HS-DSCH cell De-activation order.

If xSecondary,i= λl' r then the HS-SCCH order is a Secondary serving HS-DSCH cell Activation order.

(End of citation) The HS-SCCH orders can be used to enable or disable the TDMA multiplexing should the need arise, for example due to the changes in the HS-SCCH code allocation. The existing HS-SSCH order for activation and deactivation of the secondary serv- ing HS-DSCH cell, as set out above, can easily be extended so as to be able to be used for enablement or disablement of by using one of the reserved bits in Release 8 as the TDMA multiplexing de-activation/activation bit. In a further embodiment, each of the time division multiplexed UEs UEl, UE2 or UE3 will only demodulate a first part of N parts (three in the examples shown here) of the TTI on the HS-DSCH when it receives a part of the channelization code having the lowest index from the set of codes assigned to it.

Although the invention has been described hereinabove with reference to specific embodiments, it is not limited to these embodiments, and no doubt further alternatives will occur to the skilled person that lie within the scope of the invention as claimed.

For example, in the described embodiments the TTI has been shown as divided into three so that three UEs can each use (demodulate) a third of the TTI. However, the TTI may also be divided into fewer or more than three parts. The TTI may also be smaller or larger than 2 ms .

Furthermore, according to the invention may be interleaved with conventional HSDPA protocols in consecutive TTIs. For example, in a first TTI the channelization code may be shared between UEs in a TDMA fashion, whereas in the next TTI it may be shared between UEs in a CDMA fashion. In addition, the first and second embodiments may be employed together, for example the method of the first embodiment could be used in one TTI with the method of the second embodiment being used in a consecutive TTI.

Claims

1. A method of transmitting data in a communications network, wherein part of a data channel channeliza- tion code is shared in a TDMA fashion between user entities in the network during a transmission time interval, and wherein control channel channelization code for transmitting user specific data channel allocation information is assigned to a particular user entity and indicates which part of the transmission time interval available for data can be used by said particular user entity.
2. The method according to claim 1, wherein data is transmitted using at least partially HS-DSCH.
3. The method according to claim 2, wherein the control channel is a HS-SCCH.
4. The method according to any of claims 1 to 3, wherein the control channel indicates if TDMA is in use during the transmission time interval.
5. The method according to any one of claims 1 to 4, wherein, upon receiving a part of the channelization code having the lowest channelization code index from a set of channelization codes assigned to said particular user entity, said particular user entity will only decode a first part of N parts of the transmis- sion time interval.
6. The method according to any one of claims 1 to 5, wherein the transmission time interval is 2 ms .
7. The method according to any one of claims 1 to 6, wherein the transmission time interval is divided into three parts.
8. A communications network, comprising a network node and a plurality of user entities, wherein the network node is adapted to share part of a data channel channelization code in a TDMA fashion between the user entities during a transmission time interval and fur- ther adapted to assign a particular control channel channelization code to a particular one of the plurality of user entities indicating which part of the transmission time interval can be used by said particular one of the plurality of user entities.
9. A mobile station comprising a receiving unit for receiving a TDMA share of part of a data channel channelization code from a communications network during a transmission time interval, and processing means for demodulating the data channel channelization code, wherein the receiving unit is adapted to receive a particular control channel channelization code from the communications network indicating to the processing means during which part of the trans- mission time interval the processing means should demodulate from the data channel channelization codes in use.
PCT/EP2009/060494 2009-08-13 2009-08-13 Method of transmitting data in a communications network WO2011018112A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/EP2009/060494 WO2011018112A1 (en) 2009-08-13 2009-08-13 Method of transmitting data in a communications network

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2009/060494 WO2011018112A1 (en) 2009-08-13 2009-08-13 Method of transmitting data in a communications network

Publications (1)

Publication Number Publication Date
WO2011018112A1 true WO2011018112A1 (en) 2011-02-17

Family

ID=41732540

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2009/060494 WO2011018112A1 (en) 2009-08-13 2009-08-13 Method of transmitting data in a communications network

Country Status (1)

Country Link
WO (1) WO2011018112A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012084378A1 (en) * 2010-12-20 2012-06-28 Nokia Siemens Networks Oy Channelization code sharing between multiple users
CN103476131A (en) * 2012-06-08 2013-12-25 中兴通讯股份有限公司 Collision avoidance method under CELL_FACH state, base station and terminal thereof

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070104150A1 (en) * 2005-08-12 2007-05-10 Fernandez-Corbaton Ivan J Transmission structure supporting multi-user scheduling and MIMO transmission
US20090103497A1 (en) * 2007-10-18 2009-04-23 Qualcomm Incorporated Transmission structure supporting multi-user scheduling and mimo transmission

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070104150A1 (en) * 2005-08-12 2007-05-10 Fernandez-Corbaton Ivan J Transmission structure supporting multi-user scheduling and MIMO transmission
US20090103497A1 (en) * 2007-10-18 2009-04-23 Qualcomm Incorporated Transmission structure supporting multi-user scheduling and mimo transmission

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
HOLMA H ET AL: "Chapter 12: High-Speed Downlink Packet Access (HSDPA)" 1 January 2007 (2007-01-01), WCDMA FOR UMTS - HSPA EVOLUTION AND LTE, CHICHESTER : WILEY, PAGE(S) 363 - 402 , XP002544338 ISBN: 9780470319338 page 367, last paragraph - page 375, last paragraph *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012084378A1 (en) * 2010-12-20 2012-06-28 Nokia Siemens Networks Oy Channelization code sharing between multiple users
US9148875B2 (en) 2010-12-20 2015-09-29 Nokia Solutions And Networks Oy Channelization code sharing between multiple users
CN103476131A (en) * 2012-06-08 2013-12-25 中兴通讯股份有限公司 Collision avoidance method under CELL_FACH state, base station and terminal thereof
CN103476131B (en) * 2012-06-08 2017-10-27 中兴通讯股份有限公司 Method for collision avoidance, base station and terminal under CELL_FACH states

Similar Documents

Publication Publication Date Title
JP5689077B2 (en) Power allocation in multi-carrier extended uplink
KR101143248B1 (en) Combining acknowledgement and rate control
CN102273252B (en) Control channel feedback for multiple downlink carrier operations
RU2366087C2 (en) Wireless communication device and wireless communication method
RU2439855C2 (en) Method and apparatus for uplink acknowledgement allocation
CN101243714B (en) Mobile stations, base stations and wireless communication method
US8681747B2 (en) Wireless communication system
AU2010201681B2 (en) Scheduled and autonomous transmission and acknowledgement
Parkvall et al. The evolution of WCDMA towards higher speed downlink packet data access
US7339949B2 (en) ARQ transmission and reception methods and apparatus
CN1302675C (en) Method and apparatus for scheduling uplink packet transmission in a mobile communication system
RU2454807C2 (en) Transmitting device and method of broadcasting
JP5425804B2 (en) Downlink flow control
EP1492280B1 (en) Quality driven adaptive channel assignment in an OFDMA radio communication system
JP3660278B2 (en) The base station apparatus, mobile station apparatus, radio communication system and radio communication method
AU2007212592B2 (en) Quality of service based resource determination and allocation apparatus and procedure in high speed packet access evolution and long term evolution systems
JP4335923B2 (en) Method, apparatus, and system for data transmission and processing in a wireless communication environment
US9282567B2 (en) TTI bundling
EP2100471B1 (en) Shared control channel structure
RU2435315C2 (en) Method and device for transmission of alarm information by means of channel identifiers
US8699452B2 (en) Congestion control in a wireless data network
US20050041618A1 (en) Extended acknowledgement and rate control channel
JP4990983B2 (en) Configuration of control channel in mobile communication system
KR20120039694A (en) Channel quality reporting in a mobile communication system
EP1865736B1 (en) Radio communication apparatus and radio communication method

Legal Events

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

Ref document number: 09781800

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase in:

Ref country code: DE

122 Ep: pct app. not ent. europ. phase

Ref document number: 09781800

Country of ref document: EP

Kind code of ref document: A1