3GPP is actively working for solutions on HeNB related mobility.There are many proposals to enhance the HeNBs or HeNB-eNB mobilities. X2 based mobility between eNBs/HeNBs and HeNBs is being defined in the following cases:Between an eNB and an open access cell HeNB Between two open access cell HeNBs Between two closed HeNBs only if they have the same CSG IDBelow is a selection of some of the proposals, with my personal comments.
X2 interface between HeNB GW
It is proposed that X2 interface between HeNB GW should be supported, in order to support handover between two different areas (for e.g. shopping mall A to B).
My comment: handover between two different HeNB GW will be a very rare case, don't see why there is a need to support such interface. This is probably drived by HNB/HeNB GW manufactures.
eNB to HeNB handover
Since macro eNBs are not designed to handle many SCTP connections, therefore allowing direct connection between the eNB and HeNB will require upgrade the macro nodes in order to support large number of SCTP connections. The second issue relates to the NRTO table management by the macro eNBs. Also, require large IOT effort due to the existence of many HeNB vendors. Therefore, it is proposed that X2-Gateway based indirect interface is suggested to RAN3 for the eNB to HeNB mobility enhancement.
My comment: Don't understand why a handout from eNB would increase eNB's SCTP connections?
HeNB to HeNB mobility enhancement
It is proposed Direct X2 interface is acceptable for the HeNB to HeNB mobility enhancement.
My comment: This seems to be the correct direction.
My comment: This seems to be the correct direction.
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