Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Control channels for wireless communication

A technology for control channels and wireless communication, applied in directions such as wireless communication, transmission path sub-channel allocation, signaling allocation, etc., can solve problems such as number reduction and blocking, and achieve the effect of a well-balanced and simple implementation

Active Publication Date: 2015-06-10
FUJITSU LTD
View PDF4 Cites 8 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the eNB wishes to use only a "good" part of the spectrum (e.g. high receive SNR for that UE), the probability of blocking is likely to increase since the number of suitable candidate positions will decrease

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Control channels for wireless communication
  • Control channels for wireless communication
  • Control channels for wireless communication

Examples

Experimental program
Comparison scheme
Effect test

no. 1 approach

[0181] In the first embodiment, the network configures a set of PRB pairs for each of the 4 DCI message candidates. An example is given in Table 1(a), where the column "PRB pair" identifies the 12 pairs of PRBs numbered in frequency order (whether lowest-highest-first is unimportant) Numeric index for each pair.

[0182]

[0183] Table 1(a): Independent configuration of DCI message candidates, equal and non-overlapping

[0184] A pseudo-random selection is then made for each candidate. As an example, this can lead to the following PRB pairs selected for each DCI message candidate: 1, 4, 8, 11, or possibly: 2, 4, 7, 12, respectively. Using one of these will allow the DCI message to be sent in a PRB pair close to the best PRB pair if the channel conditions vary slowly with PRB.

[0185] exist figure 1 Another configuration is shown in (b), where the number of PRBs in each set is large and overlaps. This may not confer any particular advantage.

[0186]

[0187] Tabl...

no. 2 approach

[0212] The second embodiment is based on the first embodiment, but the configuration is done by indicating the DCI message candidate set to which a given PRB pair belongs. (Here, "DCI message candidate set" expresses the same information as each "DCI message candidate set" in the earlier table, but in a more compact form).

[0213] PRB pair

[0214] Table 2(a): Candidate configurations for each PRB pair.

[0215] Configuration signaling for this embodiment may be more efficient, but would mean that the same PRB pair in the list cannot be used for more than one candidate. Different lists may exist for each aggregation level.

[0216] Not all PRB pairs need to be assigned to a set, as shown in Table 3(b). This can help packing efficiency of DCI messages with aggregation level 1 or 2, or can allow different PRB pairs to be used for distributed transmission.

[0217] PRB pair

[0218] Table 2(b): Candidate configurations for each PRB pair, some of which are ...

no. 3 approach

[0222] The third embodiment is like the second embodiment except that resources are defined per eCCE and different sets of eCCEs can be allocated to different candidates.

[0223] In a particular variant, this can be achieved by defining a single set of resources (in terms of PRBs) for ePDCCH and applying different offsets for different candidates. As an example, this can be achieved by modifying 3.1 as follows:

[0224] Formula 3.6

[0225] here:

[0226] N eCCE,k is the total number of eCCEs allocated for potential usage of ePDCCH in subframe k.

[0227] o m,L An offset within a set of eCCEs in a subset of eCCEs for a given candidate and / or aggregation level is defined. It depends on m and / or L. This will determine how the eCCEs available for ePDCCH are distributed in the frequency domain. This can be a fixed offset for each (m,L) or can be configured.

[0228] Note that in the current LTE Release 10 specification, O m,L =m. Set O m,L ≈mN eCC...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

A method for configuring a search space within which a mobile terminal performs blind decoding attempts for potential control message candidates which may be transmitted by a base station. The frequency domain resource for which the terminal performs a blind decoding attempt for a given candidate message is determined by a pseudo-random selection (known by both terminal and network) from a pre-determined set of possible resources. A difference from prior art is that pre-determined set of resources can be different for each candidate. In a preferred embodiment the set of resources is configured by the network for each terminal and each candidate. The method may be applied for example to ePDCCH of an LTE-A wireless communication system.

Description

technical field [0001] The present invention relates to wireless communication systems, such as systems based on the 3GPP Long Term Evolution (LTE) and 3GPP LTE-A groups of standards. Background technique [0002] Wireless communication systems are widely known in which a base station (BS) forms a "cell" and communicates with terminals (referred to as user equipment or UE in LTE) within range of the BS. [0003] In such a system, each BS divides its available bandwidth (ie, frequency resources and time resources in a given cell) into individual resource allocations for the user equipments it serves. User equipment is usually mobile and thus may move among cells, giving rise to the need for handover of radio communication links between base stations of neighboring cells. A user equipment can be within range of several cells at the same time (ie be able to detect signals from several cells at the same time), but in the simplest case it communicates with one "serving" or "prim...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): H04L5/00
CPCH04L5/0053H04L5/0096H04W72/23
Inventor T·莫斯利
Owner FUJITSU LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com