GB2420250A - Controlling interference from a terminal at a base station during compressed mode - Google Patents
Controlling interference from a terminal at a base station during compressed mode Download PDFInfo
- Publication number
- GB2420250A GB2420250A GB0424931A GB0424931A GB2420250A GB 2420250 A GB2420250 A GB 2420250A GB 0424931 A GB0424931 A GB 0424931A GB 0424931 A GB0424931 A GB 0424931A GB 2420250 A GB2420250 A GB 2420250A
- Authority
- GB
- United Kingdom
- Prior art keywords
- terminal
- base station
- data rate
- compressed mode
- transmit power
- Prior art date
- Legal status (The legal status 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 status listed.)
- Granted
Links
- 238000000034 method Methods 0.000 claims abstract description 13
- 238000005259 measurement Methods 0.000 abstract description 9
- 230000005540 biological transmission Effects 0.000 abstract description 4
- 230000011664 signaling Effects 0.000 description 4
- 230000006978 adaptation Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 208000037918 transfusion-transmitted disease Diseases 0.000 description 2
- 108010003272 Hyaluronate lyase Proteins 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/18—TPC being performed according to specific parameters
- H04W52/26—TPC being performed according to specific parameters using transmission rate or quality of service QoS [Quality of Service]
- H04W52/267—TPC being performed according to specific parameters using transmission rate or quality of service QoS [Quality of Service] taking into account the information rate
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/005—Control of transmission; Equalising
-
- H04Q7/38—
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- H04Q7/3809—
-
- H04Q7/3841—
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/38—TPC being performed in particular situations
- H04W52/44—TPC being performed in particular situations in connection with interruption of transmission
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/06—TPC algorithms
- H04W52/14—Separate analysis of uplink or downlink
- H04W52/146—Uplink power control
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Quality & Reliability (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
A method of controlling interference from a terminal at a base station (node B) comprises determining that the terminal has entered compressed mode and adapting the transmit power or data rate of the terminal such that interference at the base station stays below a predetermined level. In compressed mode, the time taken to transmit data is shortened in order to provide transmission gaps in which a terminal can make handover measurements. However, transmitting the data in a shorter time can increase the transmit power and cause interference peaks. In the invention, interference control may involve keeping the power or data rate below a maximum level set by the base station, having a reduced power or data rate set by the base station or having the network set a reduction in transmit power or data rate to be applied during the compressed mode.
Description
1 U S U.S - - A METHOD OF CONTROLLING [NTERFERENCE FROM A TERMINAL AT A
BASE STATION
This invention relates to a method of controlling interference from a terminal at a base station.
Enhanced uplink (E-DCH) is a feature 0f 3rd generation project partnership (3GPP) Release 6 that aims to improve radio resource management in the uplink and hence to improve uplink throLlghput and reduce delay. A key feature of enhanced uplink is node B scheduling. In this feature, a base station or node B is given autonomy to restrict, using layer I signalling, the data i-ate at which E-DCH enabled terminals or user equipment (UE) may transmit in order to manage at least a portion of its widehand code division multiple access (WCDMA) interference. To flicilitate node B scheduling, information needs to be sent by the UE to the node B. This information may be sent using separate physical layer signalling, or as a header included with E-DCH data packets.
When two cells share a common carrier frequency the terminals can perform soft handover between the two cells which gives an associated performance gain. However if the two cells operate on a different earner frequency a terminal that does not have full dual receiver capability has to enter compressed mode in order to make measurements on the second frequency. In compressed mode the uplink and downlink transmissions are halted for a short time in order to allow the terminal to make the necessary measurements. The data that was to be transmitted is not lost but rather, the time taken to transmit the data either at the Node B or at the terminal is shortened in various ways, for example by altering the spreading factor to increase the data rate; by lowering the data rate from higher layers; or by reducing the symbol rate by puncturing during the physical layer multiplexing chain.
However, in order to transmit the data in a shorter time than it would do normally a link may have to use an increased transmit power and with the E-DCU feature, the Node B scheduler may not be able to manage the interference peaks that the terminal generates during compressed frames.
In accordance with the present invention, a method of controlling interference from a terminal at a base station comprises determining that a terminal has entered I *11 S * II.
* S I I * * * I * I I S I I I IS * S S *I* a * a S * S S S S I S * 2 * . 5 compressed mode; and adapting the transmit power or data rate of the terminal, such that interference at the base station stays below a predetermined level.
The present invention modifies the terminal behaviour such that when a terminal enters compressed mode the transmitted power or data rate is adapted to prevent an increase in interference generated at the Node B. Preferably, the terminal adapts its transmit power or data rate to keep below a maximum level set by the base station before entry into compressed mode.
Alternatively, the base station sets a reduced power or data rate for the terminal after the terminal has entered compressed mode.
In another embodiment, the network sets a reduction in transmit power or data rate for the terminal to apply during compressed mode.
On some occasions, there may be sufficient noise rise available at the base station, for no reduction in power level or data rate to be needed, so preferably, the base station indicates to the terminal whether a reduction in transmit power or data rate is iS required.
An example of a method of controlling interference from a terminal at a base station in accordance with the present invention will 110W be described with reference to the accompanying drawing in which: Figure 1 is a block diagram of a terminal within a cell for which the method of the present invention is applied.
The transmit power or data rate adaptation can be controlled in a number of ways. For example, the terminal may autonomoLisly lower its power or data rate during compressed transmission time intervals (TTI), so that the terminal does not exceed a maximum transmit power that has been signalled by a Node B scheduler during a non- compressed period of the compressed TTI. An alternative method is for the Node B to indicate that the terminal should use a lower power or data rate during a compressed frame, to compensate for the increased power that it would otherwise need in the non- compressed parts of a compressed TTT. Another option is for a radio network controller (RNC) to signal to the terminal, using higher layer signalling, a reduction that the terminal must apply to its transmit power and corresponding data rate, during compressed frames, so as not to exceed the permitted interference at the Node B. a,, S 0 500 a a I a 0 0 0 * * I * I S S SO * S P *I* S S * P * S * * S S e a a 3 a a S.. I S In some situations, it may not actually be necessary to reduce the transmit power or data rate because there is sufficient noise rise overhead available, so the Node B can indicate to the terminal whether or not to apply the adaptation to the allowed transmit power or data rate.
Either transmit power or data rate used by the terminal can be controlled to prevent disruption to the cell when it enters compressed mode, but as they are directly related, a change to one gives rise to a change in the other.
The following examples make reference to the block diagram in Fig. 1.
In a first example, a terminal is positioned between two cells operating on different frequencies. !he terminal or UE I is scheduled by a base station or node B, NB2, but it must also make measurements on a different frequency from another node B, NB 1.
The terminal I must autonomously adapt its transmit power at the time that the terminal enters compressed mode to make measurements on the second cell NBI s frequency.
At the same time that the terminal enters compressed mode its scheduling Node B, NB2 sends Layer I signalling to the terminal 1 informing it of which data rate it may use in its uplink.
The terminal 1 then re-interprets the information from the scheduling Node B, NB2, taking into account the fact that it must transmit in compressed mode TTIs and ensures that these compressed transmissions do not violate the terminal's maximum transmit power that was set by the scheduling Node B. The terminal transmits its data as necessary and makes its inter-frequency measurements as required without causing extra interference to the Node B. The Node B enhanced uplink scheduling cycle continues unaffected by the terminal running in compressed mode.
In the next example, a scheduling Node B, NB2 controls the transmit power of the UE I. The terminal I is positioned between two cells NB 1, NB2 operating on different frequencies, so the terminal must enter compressed mode to make measurements on the second cell, NB 1 s frequency. At the same time that the terminal 1 enters a compressed mode TTI, the scheduling Node B, NB 2 schedules a data rate for the terminal based on the interference it will generate in its compressed interval.
The terminal 1 then transmits using this new data rate and related power level and makes its nleasureinents as necessary without creating too much interference in the rest of the cell. The Node B enhanced uplink scheduling cycle then continues unaffected by the liE running in compressed mode. St. S
S * S * * S U * I I * S S I US
I U I III S S S S
* I U I S U S S S 4 * , *s * In a third example, a terminal is arranged between two cells, NB 1, NB2 operating on different frequencies. When the terminal wants to make measurements on the second cell's frequency, the terminal 1 must enter compressed mode. At the same time that the terminal enters compressed mode, an RNC 2 signals to the terminal the reduction in transmit power, in cIB, that it must apply and the corresponding data rate allowed by the scheduling Node B, NB2 (luring compressed TTIs. The terminal I calculates this new power level and then transmits using the calculated power level. It can then make its measurements as necessary without creating too much interference in the rest of the cell.
Claims (5)
1. A method of controllmg interference from a tenninal at a base station, the method compnsing determining that a terminal has entered compressed mode; and adapting the transmit power or data rate of the terminal, such that mterference at the base station stays below a predetermined level.
2. A method according to claim I, wherein the terminal adapts its transmit power or data rate to keep below a maximum level set by the base station before entry into compressed mode.
3. A method according to claim I, wherein the base station sets a reduced power or data rate for the terminal after the terminal has entered compressed mode.
4. A method according to claim I, wherein the network sets a reduction in transmit power or data rate for the terminal to apply during compressed mode.
5. A method according to any preceding claim, wherein the base station indicates to the tenninal whether a reduction in transmit power or data rate is required.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB0424931A GB2420250B (en) | 2004-11-12 | 2004-11-12 | A method of controlling interference from a terminal at a base station |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB0424931A GB2420250B (en) | 2004-11-12 | 2004-11-12 | A method of controlling interference from a terminal at a base station |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB0424931D0 GB0424931D0 (en) | 2004-12-15 |
| GB2420250A true GB2420250A (en) | 2006-05-17 |
| GB2420250B GB2420250B (en) | 2007-09-19 |
Family
ID=33523567
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB0424931A Active GB2420250B (en) | 2004-11-12 | 2004-11-12 | A method of controlling interference from a terminal at a base station |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2420250B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101873684A (en) * | 2009-04-21 | 2010-10-27 | 株式会社Ntt都科摩 | Communication terminal that in wireless communication system, uses and method |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2527752C2 (en) * | 2010-06-13 | 2014-09-10 | ЗедТиИ КОРПОРЕЙШН | Method, system and node b for indicating state information |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2355887A (en) * | 1999-10-25 | 2001-05-02 | Motorola Ltd | Reduction of transmit power in a mobile station |
| US6385437B1 (en) * | 1999-02-13 | 2002-05-07 | Samsung Electronics, Co., Ltd. | Power control apparatus and method for inter-frequency handoff in CDMA communication system |
| US20030137958A1 (en) * | 1998-03-26 | 2003-07-24 | Mitsubishi Denki Kabushiki Kaisha | Spread spectrum communication device and spread spectrum communication method |
-
2004
- 2004-11-12 GB GB0424931A patent/GB2420250B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030137958A1 (en) * | 1998-03-26 | 2003-07-24 | Mitsubishi Denki Kabushiki Kaisha | Spread spectrum communication device and spread spectrum communication method |
| US6385437B1 (en) * | 1999-02-13 | 2002-05-07 | Samsung Electronics, Co., Ltd. | Power control apparatus and method for inter-frequency handoff in CDMA communication system |
| GB2355887A (en) * | 1999-10-25 | 2001-05-02 | Motorola Ltd | Reduction of transmit power in a mobile station |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101873684A (en) * | 2009-04-21 | 2010-10-27 | 株式会社Ntt都科摩 | Communication terminal that in wireless communication system, uses and method |
| EP2244511A3 (en) * | 2009-04-21 | 2011-05-25 | NTT DoCoMo, Inc. | Communication terminal and method for use in radio communication system |
| US8295873B2 (en) | 2009-04-21 | 2012-10-23 | Ntt Docomo, Inc. | Communication terminal and method for use in radio communication system |
| CN101873684B (en) * | 2009-04-21 | 2013-07-17 | 株式会社Ntt都科摩 | Communication terminal and method for use in radio communication system |
Also Published As
| Publication number | Publication date |
|---|---|
| GB0424931D0 (en) | 2004-12-15 |
| GB2420250B (en) | 2007-09-19 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 732E | Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977) |
Free format text: REGISTERED BETWEEN 20090205 AND 20090211 |
|
| 732E | Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977) |
Free format text: REGISTERED BETWEEN 20200402 AND 20200408 |